52 files changed, 336 insertions, 274 deletions
diff --git a/src/anaconda/feature.json b/src/anaconda/devcontainer-feature.json
index f733b63..f733b63 100644
--- a/src/anaconda/feature.json
+++ b/src/anaconda/devcontainer-feature.json
diff --git a/src/anaconda/install.sh b/src/anaconda/install.sh
index f7dfd0b..272ba73 100644
--- a/src/anaconda/install.sh
+++ b/src/anaconda/install.sh
@@ -6,13 +6,12 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/anaconda.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./anaconda-debian.sh [Conda version] [Non-root user] [Add rc files flag]
 
-VERSION=${1:-"latest"}
-USERNAME=${2:-"automatic"}
-UPDATE_RC=${3:-"true"}
 
+VERSION=${VERSION:-"latest"}
+
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
 CONDA_DIR=${CONDA_DIR:-"/usr/local/conda"}
 
 set -eux
@@ -32,7 +31,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/aws-cli/feature.json b/src/aws-cli/devcontainer-feature.json
index ee1df10..ee1df10 100644
--- a/src/aws-cli/feature.json
+++ b/src/aws-cli/devcontainer-feature.json
diff --git a/src/aws-cli/install.sh b/src/aws-cli/install.sh
index 0d204de..b2566c9 100755
--- a/src/aws-cli/install.sh
+++ b/src/aws-cli/install.sh
@@ -6,12 +6,11 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/awscli.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./awscli-debian.sh [AWS CLI version]
 
 set -e
 
-AWSCLI_VERSION=${1:-"latest"}
+VERSION=${VERSION:-"latest"}
+
 AWSCLI_GPG_KEY=FB5DB77FD5C118B80511ADA8A6310ACC4672475C
 AWSCLI_GPG_KEY_MATERIAL="-----BEGIN PGP PUBLIC KEY BLOCK-----
 
@@ -108,8 +107,8 @@ install() {
     local scriptSigFile=awscli.sig
 
     # See Linux install docs at https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html
-    if [ "${AWSCLI_VERSION}" != "latest" ]; then
-        local versionStr=-${AWSCLI_VERSION}
+    if [ "${VERSION}" != "latest" ]; then
+        local versionStr=-${VERSION}
     fi
     architecture=$(dpkg --print-architecture)
     case "${architecture}" in
diff --git a/src/azure-cli/feature.json b/src/azure-cli/devcontainer-feature.json
index 6ae3769..6ae3769 100644
--- a/src/azure-cli/feature.json
+++ b/src/azure-cli/devcontainer-feature.json
diff --git a/src/azure-cli/install.sh b/src/azure-cli/install.sh
index a7f2a84..d5a586f 100644
--- a/src/azure-cli/install.sh
+++ b/src/azure-cli/install.sh
@@ -6,12 +6,11 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/azcli.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./azcli-debian.sh
 
 set -e
 
-AZ_VERSION=${1:-"latest"}
+AZ_VERSION=${VERSION:-"latest"}
+
 MICROSOFT_GPG_KEYS_URI="https://packages.microsoft.com/keys/microsoft.asc"
 AZCLI_ARCHIVE_ARCHITECTURES="amd64"
 AZCLI_ARCHIVE_VERSION_CODENAMES="stretch buster bullseye bionic focal"
diff --git a/src/common/feature.json b/src/common/devcontainer-feature.json
index d6b94f2..318d0cf 100644
--- a/src/common/feature.json
+++ b/src/common/devcontainer-feature.json
@@ -3,42 +3,53 @@
     "name": "common",
     "description": "common",
     "options": {
-        "installZsh": {
+        "install_Zsh": {
             "type": "boolean",
             "default": true,
             "description": "Install ZSH?"
         },
-        "installOhMyZsh": {
+        "install_Oh_My_Zsh": {
             "type": "boolean",
             "default": true,
             "description": "Install Oh My Zsh!?"
         },
-        "upgradePackages": {
-            "type":"boolean",
+        "upgrade_packages": {
+            "type": "boolean",
             "default": true,
             "description": "Upgrade OS packages?"
         },
         "username": {
-            "type":"string",
-            "proposals": ["vscode", "codespace", "none", "automatic"],
+            "type": "string",
+            "proposals": [
+                "vscode",
+                "codespace",
+                "none",
+                "automatic"
+            ],
             "default": "automatic",
             "description": "Enter name of non-root user to configure or none to skip"
         },
-        "uid": {
-            "type":"string",
-            "proposals": ["1000", "automatic"],
+        "user_uid": {
+            "type": "string",
+            "proposals": [
+                "1000",
+                "automatic"
+            ],
             "default": "automatic",
             "description": "Enter uid for non-root user"
         },
-        "gid": {
+        "user_gid": {
             "type": "string",
-            "proposals": ["1000", "automatic"],
+            "proposals": [
+                "1000",
+                "automatic"
+            ],
             "default": "automatic",
             "description": "Enter gid for non-root user"
         },
-        "nonFreePackages": {
-            "type":"boolean",
-            "default": true,
+        "add_non_free_packages": {
+            "type": "boolean",
+            "default": false,
             "description": "Add packages from non-free Debian repository?"
         }
     },
diff --git a/src/common/install.sh b/src/common/install.sh
index 77c64db..ab8adb0 100644
--- a/src/common/install.sh
+++ b/src/common/install.sh
@@ -6,18 +6,17 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/common.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./common-debian.sh [install zsh flag] [username] [user UID] [user GID] [upgrade packages flag] [install Oh My Zsh! flag] [Add non-free packages]
 
 set -e
 
-INSTALL_ZSH=${1:-"true"}
-USERNAME=${2:-"automatic"}
-USER_UID=${3:-"automatic"}
-USER_GID=${4:-"automatic"}
-UPGRADE_PACKAGES=${5:-"true"}
-INSTALL_OH_MYS=${6:-"true"}
-ADD_NON_FREE_PACKAGES=${7:-"false"}
+INSTALL_ZSH=${INSTALL_ZSH:-"true"}
+INSTALL_OH_MY_ZSH=${INSTALL_OH_MY_ZSH:-"true"}
+UPGRADE_PACKAGES=${UPGRADE_PACKAGES:-"true"}
+USERNAME=${USERNAME:-"automatic"}
+USER_UID=${USER_UID:-"automatic"}
+USER_GID=${USER_GID:-"automatic"}
+ADD_NON_FREE_PACKAGES=${ADD_NON_FREE_PACKAGES:-"false"}
+
 SCRIPT_DIR="$(cd $(dirname "${BASH_SOURCE[0]}") && pwd)"
 MARKER_FILE="/usr/local/etc/vscode-dev-containers/common"
 
@@ -35,7 +34,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
@@ -85,6 +84,7 @@ if [ "${PACKAGES_ALREADY_INSTALLED}" != "true" ]; then
         net-tools \
         psmisc \
         curl \
+        tree \
         wget \
         rsync \
         ca-certificates \
@@ -376,7 +376,7 @@ if [ "${INSTALL_ZSH}" = "true" ]; then
     # Adapted, simplified inline Oh My Zsh! install steps that adds, defaults to a codespaces theme.
     # See https://github.com/ohmyzsh/ohmyzsh/blob/master/tools/install.sh for official script.
     oh_my_install_dir="${user_rc_path}/.oh-my-zsh"
-    if [ ! -d "${oh_my_install_dir}" ] && [ "${INSTALL_OH_MYS}" = "true" ]; then
+    if [ ! -d "${oh_my_install_dir}" ] && [ "${INSTALL_OH_MY_ZSH}" = "true" ]; then
         template_path="${oh_my_install_dir}/templates/zshrc.zsh-template"
         user_rc_file="${user_rc_path}/.zshrc"
         umask g-w,o-w
diff --git a/src/desktop-lite/feature.json b/src/desktop-lite/devcontainer-feature.json
index 4ad8b8d..fa7649c 100644
--- a/src/desktop-lite/feature.json
+++ b/src/desktop-lite/devcontainer-feature.json
@@ -4,25 +4,43 @@
     "options": {
         "version": {
             "type": "string",
-            "enum": ["latest"],
+            "proposals": [
+                "latest"
+            ],
             "default": "latest",
-            "description": "Currently unused."
+            "description": "Currently Unused!"
         },
-        "password": {
+        "novnc_version": {
             "type": "string",
-            "proposals": ["vscode","codespaces","password"],
+            "proposals": [
+                "1.2.0"
+            ],
+            "default": "1.2.0",
+            "description": "NoVnc Version"
+        },
+        "vnc_password": {
+            "type": "string",
+            "proposals": [
+                "vscode",
+                "codespaces",
+                "password"
+            ],
             "default": "vscode",
             "description": "Enter a password for desktop connections"
         },
-        "webPort": {
+        "novnc_port": {
             "type": "string",
-            "proposals": ["6080"],
+            "proposals": [
+                "6080"
+            ],
             "default": "6080",
-            "description": "Enter a port for the desktop web client"
+            "description": "Enter a port for the VNC web client"
         },
-        "vncPort": {
+        "vnc_port": {
             "type": "string",
-            "proposals": ["5901"],
+            "proposals": [
+                "5901"
+            ],
             "default": "5901",
             "description": "Enter a port for the desktop VNC server"
         }
diff --git a/src/desktop-lite/install.sh b/src/desktop-lite/install.sh
index ac149c4..e9f74f1 100644
--- a/src/desktop-lite/install.sh
+++ b/src/desktop-lite/install.sh
@@ -6,16 +6,16 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/desktop-lite.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./desktop-lite-debian.sh [non-root user] [Desktop password] [Install web client flag] [VNC port] [Web Port]
 
-USERNAME=${1:-"automatic"}
-VNC_PASSWORD=${2:-"vscode"}
-INSTALL_NOVNC=${3:-"true"}
-VNC_PORT="${4:-5901}"
-NOVNC_PORT="${5:-6080}"
+NOVNC_VERSION=${NOVNC_VERSION:-"1.2.0"} # TODO: Add in a 'latest' auto-detect and swap name to 'version'
+VNC_PASSWORD=${VNC_PASSWORD:-"vscode"}
+NOVNC_PORT="${NOVNC_PORT:-6080}"
+VNC_PORT="${VNC_PORT:-5901}"
+
+INSTALL_NOVNC=${INSTALL_NOVNC:-"true"}
+USERNAME=${USERNAME:-"automatic"}
+
 
-NOVNC_VERSION=1.2.0
 WEBSOCKETIFY_VERSION=0.10.0
 
 package_list="
@@ -72,7 +72,7 @@ fi
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/docker-from-docker/feature.json b/src/docker-from-docker/devcontainer-feature.json
index ce955a7..f9c5d28 100644
--- a/src/docker-from-docker/feature.json
+++ b/src/docker-from-docker/devcontainer-feature.json
@@ -4,7 +4,11 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": ["latest", "none", "20.10"],
+            "proposals": [
+                "latest",
+                "none",
+                "20.10"
+            ],
             "default": "latest",
             "description": "Select or enter a Docker/Moby CLI version. (Availability can vary by OS version.)"
         },
@@ -13,9 +17,12 @@
             "default": true,
             "description": "Install OSS Moby build instead of Docker CE"
         },
-        "dockerDashComposeVersion": {
+        "docker_dash_compose_version": {
             "type": "string",
-            "enum": ["v1", "v2" ],
+            "enum": [
+                "v1",
+                "v2"
+            ],
             "default": "v1",
             "description": "Compose version to use for docker-compose (v1 or v2)"
         }
@@ -29,9 +36,9 @@
     ],
     "mounts": [
         {
-            "source":"/var/run/docker.sock", 
-             "target":"/var/run/docker-host.sock", 
-             "type":"bind"
+            "source": "/var/run/docker.sock",
+            "target": "/var/run/docker-host.sock",
+            "type": "bind"
         }
     ],
     "install": {
diff --git a/src/docker-from-docker/install.sh b/src/docker-from-docker/install.sh
index 1102ae9..88ad52f 100644
--- a/src/docker-from-docker/install.sh
+++ b/src/docker-from-docker/install.sh
@@ -6,16 +6,16 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/docker.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./docker-debian.sh [enable non-root docker socket access flag] [source socket] [target socket] [non-root user] [use moby] [CLI version] [Major version for docker-compose]
-
-ENABLE_NONROOT_DOCKER=${1:-"true"}
-SOURCE_SOCKET=${2:-"/var/run/docker-host.sock"}
-TARGET_SOCKET=${3:-"/var/run/docker.sock"}
-USERNAME=${4:-"automatic"}
-USE_MOBY=${5:-"true"}
-DOCKER_VERSION=${6:-"latest"}
-DOCKER_DASH_COMPOSE_VERSION=${7:-"v1"} # v1 or v2
+
+DOCKER_VERSION=${VERSION:-"latest"}
+USE_MOBY=${MOBY:-"true"}
+DOCKER_DASH_COMPOSE_VERSION=${DOCKER_DASH_COMPOSE_VERSION:-"v1"} # v1 or v2
+
+ENABLE_NONROOT_DOCKER=${ENABLE_NONROOT_DOCKER:-"true"}
+SOURCE_SOCKET=${SOURCE_SOCKET:-"/var/run/docker-host.sock"}
+TARGET_SOCKET=${TARGET_SOCKET:-"/var/run/docker.sock"}
+USERNAME=${USERNAME:-"automatic"}
+
 MICROSOFT_GPG_KEYS_URI="https://packages.microsoft.com/keys/microsoft.asc"
 DOCKER_MOBY_ARCHIVE_VERSION_CODENAMES="buster bullseye bionic focal jammy"
 DOCKER_LICENSED_ARCHIVE_VERSION_CODENAMES="buster bullseye bionic focal hirsute impish jammy"
@@ -31,7 +31,7 @@ fi
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/docker-in-docker/feature.json b/src/docker-in-docker/devcontainer-feature.json
index 0aa95e9..096756d 100644
--- a/src/docker-in-docker/feature.json
+++ b/src/docker-in-docker/devcontainer-feature.json
@@ -4,7 +4,11 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": ["latest", "none", "20.10" ],
+            "proposals": [
+                "latest",
+                "none",
+                "20.10"
+            ],
             "default": "latest",
             "description": "Select or enter a Docker/Moby Engine version. (Availability can vary by OS version.)"
         },
@@ -13,9 +17,12 @@
             "default": true,
             "description": "Install OSS Moby build instead of Docker CE"
         },
-        "dockerDashComposeVersion": {
+        "docker_dash_compose_version": {
             "type": "string",
-            "enum": ["v1", "v2" ],
+            "enum": [
+                "v1",
+                "v2"
+            ],
             "default": "v1",
             "description": "Default version of Docker Compose (v1 or v2)"
         }
@@ -30,9 +37,9 @@
     ],
     "mounts": [
         {
-            "source":"dind-var-lib-docker", 
-             "target":"/var/lib/docker", 
-             "type":"volume"
+            "source": "dind-var-lib-docker",
+            "target": "/var/lib/docker",
+            "type": "volume"
         }
     ],
     "install": {
diff --git a/src/docker-in-docker/install.sh b/src/docker-in-docker/install.sh
index a525203..02dd260 100644
--- a/src/docker-in-docker/install.sh
+++ b/src/docker-in-docker/install.sh
@@ -6,14 +6,15 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/docker-in-docker.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./docker-in-docker-debian.sh [enable non-root docker access flag] [non-root user] [use moby] [Engine/CLI Version] [Major version for docker-compose]
 
-ENABLE_NONROOT_DOCKER=${1:-"true"}
-USERNAME=${2:-"automatic"}
-USE_MOBY=${3:-"true"}
-DOCKER_VERSION=${4:-"latest"} # The Docker/Moby Engine + CLI should match in version
-DOCKER_DASH_COMPOSE_VERSION=${5:-"v1"} # v1 or v2
+
+DOCKER_VERSION=${VERSION:-"latest"} # The Docker/Moby Engine + CLI should match in version
+USE_MOBY=${MOBY:-"true"}
+DOCKER_DASH_COMPOSE_VERSION=${DOCKER_DASH_COMPOSE_VERSION:-"v1"} # v1 or v2
+
+ENABLE_NONROOT_DOCKER=${ENABLE_NONROOT_DOCKER:-"true"}
+USERNAME=${USERNAME:-"automatic"}
+
 MICROSOFT_GPG_KEYS_URI="https://packages.microsoft.com/keys/microsoft.asc"
 DOCKER_MOBY_ARCHIVE_VERSION_CODENAMES="buster bullseye bionic focal jammy"
 DOCKER_LICENSED_ARCHIVE_VERSION_CODENAMES="buster bullseye bionic focal hirsute impish jammy"
@@ -40,7 +41,7 @@ fi
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/dotnet/feature.json b/src/dotnet/devcontainer-feature.json
index 4e2c7a7..04b2811 100644
--- a/src/dotnet/feature.json
+++ b/src/dotnet/devcontainer-feature.json
@@ -4,21 +4,26 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": ["latest","6.0","5.0","3.1"],
+            "proposals": [
+                "latest",
+                "6.0",
+                "5.0",
+                "3.1"
+            ],
             "default": "latest",
             "description": "Select or enter a dotnet CLI version. (Available versions may vary by Linux distribution.)"
         },
-        "runtimeOnly": {
-            "type":"boolean",
+        "runtime_only": {
+            "type": "boolean",
             "default": false,
             "description": "Install just the dotnet runtime if true, and sdk if false."
         },
-        "overrideDefaultVersion": {
-          "type": "boolean",
-          "default": "true",
-          "description": "If true, overrides existing version (if any) of dotnet on the PATH"
+        "override_default_version": {
+            "type": "boolean",
+            "default": "true",
+            "description": "If true, overrides existing version (if any) of dotnet on the PATH"
         },
-        "installUsingApt": {
+        "install_using_apt": {
             "type": "boolean",
             "default": "true",
             "description": "If true, it installs using apt instead of the release URL"
diff --git a/src/dotnet/install.sh b/src/dotnet/install.sh
index 4052dbd..0a147bc 100644
--- a/src/dotnet/install.sh
+++ b/src/dotnet/install.sh
@@ -6,17 +6,16 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/dotnet.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./dotnet-debian.sh [.NET version] [.NET runtime only] [non-root user] [add TARGET_DOTNET_ROOT to rc files flag] [.NET root] [access group name]
-
-DOTNET_VERSION=${1:-"latest"}
-DOTNET_RUNTIME_ONLY=${2:-"false"}
-USERNAME=${3:-"automatic"}
-UPDATE_RC=${4:-"true"}
-TARGET_DOTNET_ROOT=${5:-"/usr/local/dotnet"}
-ACCESS_GROUP=${6:-"dotnet"}
-OVERRIDE_DEFAULT_VERSION=${7:-"true"}
-INSTALL_USING_APT=${8:-"true"}
+
+DOTNET_VERSION=${VERSION:-"latest"}
+DOTNET_RUNTIME_ONLY=${RUNTIME_ONLY:-"false"}
+OVERRIDE_DEFAULT_VERSION=${OVERRIDE_DEFAULT_VERSION:-"true"}
+INSTALL_USING_APT=${INSTALL_USING_APT:-"true"}
+
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
+TARGET_DOTNET_ROOT=${TARGET_DOTNET_ROOT:-"/usr/local/dotnet"}
+ACCESS_GROUP=${ACCESS_GROUP:-"dotnet"}
 
 MICROSOFT_GPG_KEYS_URI="https://packages.microsoft.com/keys/microsoft.asc"
 DOTNET_ARCHIVE_ARCHITECTURES="amd64"
diff --git a/src/git-lfs/feature.json b/src/git-lfs/devcontainer-feature.json
index 892670b..516454e 100644
--- a/src/git-lfs/feature.json
+++ b/src/git-lfs/devcontainer-feature.json
@@ -4,9 +4,12 @@
     "options": {
         "version": {
             "type": "string",
-            "enum": ["latest", "none"],
+            "enum": [
+                "latest",
+                "none"
+            ],
             "default": "latest",
-            "description": "Currently unused."
+            "description": "Select version of Git LFS to install"
         }
     },
     "install": {
diff --git a/src/git-lfs/install.sh b/src/git-lfs/install.sh
index dd9e702..0ba88c3 100644
--- a/src/git-lfs/install.sh
+++ b/src/git-lfs/install.sh
@@ -6,10 +6,9 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/git-lfs.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./git-lfs-debian.sh [version]
 
-GIT_LFS_VERSION=${1:-"latest"}
+GIT_LFS_VERSION=${VERSION:-"latest"}
+
 GIT_LFS_ARCHIVE_GPG_KEY_URI="https://packagecloud.io/github/git-lfs/gpgkey"
 GIT_LFS_ARCHIVE_ARCHITECTURES="amd64"
 GIT_LFS_ARCHIVE_VERSION_CODENAMES="stretch buster bullseye bionic focal"
diff --git a/src/git/feature.json b/src/git/devcontainer-feature.json
index 6d9686b..6d9686b 100644
--- a/src/git/feature.json
+++ b/src/git/devcontainer-feature.json
diff --git a/src/git/install.sh b/src/git/install.sh
index 6900897..1da6500 100644
--- a/src/git/install.sh
+++ b/src/git/install.sh
@@ -6,11 +6,9 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/git-from-src.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./git-from-src-debian.sh [version] [use PPA if available]
 
-GIT_VERSION=${1:-"latest"} # 'system' checks the base image first, else installs 'latest'
-USE_PPA_IF_AVAILABLE=${2:-"false"}
+GIT_VERSION=${VERSION:-"latest"} # 'system' checks the base image first, else installs 'latest'
+USE_PPA_IF_AVAILABLE=${PPA:-"false"}
 
 GIT_CORE_PPA_ARCHIVE_GPG_KEY=E1DD270288B4E6030699E45FA1715D88E1DF1F24
 GPG_KEY_SERVERS="keyserver hkp://keyserver.ubuntu.com:80
diff --git a/src/github-cli/feature.json b/src/github-cli/devcontainer-feature.json
index 9a00923..a99634c 100644
--- a/src/github-cli/feature.json
+++ b/src/github-cli/devcontainer-feature.json
@@ -4,7 +4,10 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": ["latest", "none"],
+            "proposals": [
+                "latest",
+                "none"
+            ],
             "default": "latest",
             "description": "Select version of the GitHub CLI, if not latest."
         }
diff --git a/src/github-cli/install.sh b/src/github-cli/install.sh
index 01ad4d4..4fea41b 100644
--- a/src/github-cli/install.sh
+++ b/src/github-cli/install.sh
@@ -6,10 +6,8 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/github.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./github-debian.sh [version]
 
-CLI_VERSION=${1:-"latest"}
+CLI_VERSION=${VERSION:-"latest"}
 
 GITHUB_CLI_ARCHIVE_GPG_KEY=C99B11DEB97541F0
 GPG_KEY_SERVERS="keyserver hkp://keyserver.ubuntu.com:80
diff --git a/src/go/feature.json b/src/go/devcontainer-feature.json
index 387839e..387839e 100644
--- a/src/go/feature.json
+++ b/src/go/devcontainer-feature.json
diff --git a/src/go/install.sh b/src/go/install.sh
index 86d652b..96a1b38 100644
--- a/src/go/install.sh
+++ b/src/go/install.sh
@@ -6,15 +6,14 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/go.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./go-debian.sh [Go version] [GOROOT] [GOPATH] [non-root user] [Add GOPATH, GOROOT to rc files flag] [Install tools flag]
 
-TARGET_GO_VERSION=${1:-"latest"}
-TARGET_GOROOT=${2:-"/usr/local/go"}
-TARGET_GOPATH=${3:-"/go"}
-USERNAME=${4:-"automatic"}
-UPDATE_RC=${5:-"true"}
-INSTALL_GO_TOOLS=${6:-"true"}
+TARGET_GO_VERSION=${VERSION:-"latest"}
+
+TARGET_GOROOT=${TARGET_GOROOT:-"/usr/local/go"}
+TARGET_GOPATH=${TARGET_GOPATH:-"/go"}
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
+INSTALL_GO_TOOLS=${INSTALL_GO_TOOLS:-"true"}
 
 # https://www.google.com/linuxrepositories/
 GO_GPG_KEY_URI="https://dl.google.com/linux/linux_signing_key.pub"
@@ -35,7 +34,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/hugo/feature.json b/src/hugo/devcontainer-feature.json
index 1d06486..1d06486 100644
--- a/src/hugo/feature.json
+++ b/src/hugo/devcontainer-feature.json
diff --git a/src/hugo/install.sh b/src/hugo/install.sh
index de1d03c..9e25aeb 100644
--- a/src/hugo/install.sh
+++ b/src/hugo/install.sh
@@ -6,12 +6,11 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/hugo.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./hugo-debian.sh [Hugo version] [HUGO_DIR] [Non-root user] [Add rc files flag]
 
-VERSION=${1:-"latest"}
-USERNAME=${3:-"automatic"}
-UPDATE_RC=${4:-"true"}
+VERSION=${VERSION:-"latest"}
+
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
 
 HUGO_DIR=${HUGO_DIR:-"/usr/local/hugo"}
 
@@ -31,7 +30,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/java/feature.json b/src/java/devcontainer-feature.json
index 64d5d65..64d5d65 100644
--- a/src/java/feature.json
+++ b/src/java/devcontainer-feature.json
diff --git a/src/java/install.sh b/src/java/install.sh
index f5880cd..7918568 100644
--- a/src/java/install.sh
+++ b/src/java/install.sh
@@ -9,10 +9,11 @@
 #
 # Syntax: ./java-debian.sh [JDK version] [SDKMAN_DIR] [non-root user] [Add to rc files flag]
 
-JAVA_VERSION=${1:-"lts"}
-export SDKMAN_DIR=${2:-"/usr/local/sdkman"}
-USERNAME=${3:-"automatic"}
-UPDATE_RC=${4:-"true"}
+JAVA_VERSION=${VERSION:-"lts"}
+
+export SDKMAN_DIR=${SDKMAN_DIR:-"/usr/local/sdkman"}
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
 
 set -e
 
@@ -30,7 +31,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/java/wrapper.sh b/src/java/wrapper.sh
index 4d2aef3..d7f05de 100644
--- a/src/java/wrapper.sh
+++ b/src/java/wrapper.sh
@@ -27,7 +27,7 @@ if [ "${is_jdk_8}" = "true" ]; then
     # Determine the appropriate non-root user
     username=""
     possible_users=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for current_user in ${possible_users[@]}; do
+    for current_user in "${POSSIBLE_USERS[@]}"; do
         if id -u ${current_user} > /dev/null 2>&1; then
             username=${current_user}
             break
diff --git a/src/jupyterlab/feature.json b/src/jupyterlab/devcontainer-feature.json
index 86010c3..8546925 100644
--- a/src/jupyterlab/feature.json
+++ b/src/jupyterlab/devcontainer-feature.json
@@ -4,13 +4,19 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": ["latest", "3.6.2"],
+            "proposals": [
+                "latest",
+                "3.6.2"
+            ],
             "default": "latest",
             "description": "Select or enter a jupyterlab version."
         },
-        "pythonBinary": {
+        "python_binary": {
             "type": "string",
-            "proposals": ["python", "/usr/local/python/bin/python"],
+            "proposals": [
+                "python",
+                "/usr/local/python/bin/python"
+            ],
             "default": "python",
             "description": "Select or enter the python binary path."
         }
diff --git a/src/jupyterlab/install.sh b/src/jupyterlab/install.sh
index 4d426a4..f6c30d3 100644
--- a/src/jupyterlab/install.sh
+++ b/src/jupyterlab/install.sh
@@ -6,15 +6,14 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/jupyterlab.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./jupyter-debian.sh
 
 set -ex
 
-VERSION=${1:-"latest"}
-USERNAME=${2:-"automatic"}
-PYTHON=${3:-"python"}
-ALLOW_ALL_ORIGINS=${4:-""}
+VERSION=${VERSION:-"latest"}
+PYTHON=${PYTHON_BINARY:-"python"}
+
+USERNAME=${USERNAME:-"automatic"}
+ALLOW_ALL_ORIGINS=${ALLOW_ALL_ORIGINS:-""}
 
 if [ "$(id -u)" -ne 0 ]; then
     echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
@@ -25,7 +24,7 @@ fi
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/kubectl-helm-minikube/feature.json b/src/kubectl-helm-minikube/devcontainer-feature.json
index 7033c7a..8b50879 100644
--- a/src/kubectl-helm-minikube/feature.json
+++ b/src/kubectl-helm-minikube/devcontainer-feature.json
@@ -4,19 +4,29 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": ["latest", "none", "1.23", "1.22", "1.21"],
+            "proposals": [
+                "latest",
+                "none",
+                "1.23",
+                "1.22",
+                "1.21"
+            ],
             "default": "latest",
             "description": "Select or enter a Kubernetes version to install"
         },
         "helm": {
             "type": "string",
-            "proposals": ["latest"],
+            "proposals": [
+                "latest"
+            ],
             "default": "latest",
             "description": "Select or enter a Helm version to install"
         },
         "minikube": {
             "type": "string",
-            "proposals": ["latest"],
+            "proposals": [
+                "latest"
+            ],
             "default": "latest",
             "description": "Select or enter a Minikube version to install"
         }
@@ -26,9 +36,9 @@
     ],
     "mounts": [
         {
-            "source":"minikube-config", 
-             "target":"/home/vscode/.minikube", 
-             "type":"volume"
+            "source": "minikube-config",
+            "target": "/home/vscode/.minikube",
+            "type": "volume"
         }
     ],
     "install": {
diff --git a/src/kubectl-helm-minikube/install.sh b/src/kubectl-helm-minikube/install.sh
index 0981024..b10f578 100644
--- a/src/kubectl-helm-minikube/install.sh
+++ b/src/kubectl-helm-minikube/install.sh
@@ -6,18 +6,17 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/kubectl-helm.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./kubectl-helm-debian.sh [kubectl verison] [Helm version] [minikube version] [kubectl SHA256] [Helm SHA256] [minikube SHA256]
 
 set -e
 
-KUBECTL_VERSION="${1:-"latest"}"
-HELM_VERSION="${2:-"latest"}"
-MINIKUBE_VERSION="${3:-"none"}" # latest is also valid
-KUBECTL_SHA256="${4:-"automatic"}"
-HELM_SHA256="${5:-"automatic"}"
-MINIKUBE_SHA256="${6:-"automatic"}"
-USERNAME=${7:-"automatic"}
+KUBECTL_VERSION="${VERSION:-"latest"}"
+HELM_VERSION="${HELM:-"latest"}"
+MINIKUBE_VERSION="${MINIKUBE:-"none"}" # latest is also valid
+
+KUBECTL_SHA256="${KUBECTL_SHA256:-"automatic"}"
+HELM_SHA256="${HELM_SHA256:-"automatic"}"
+MINIKUBE_SHA256="${MINIKUBE_SHA256:-"automatic"}"
+USERNAME=${USERNAME:-"automatic"}
 
 HELM_GPG_KEYS_URI="https://raw.githubusercontent.com/helm/helm/main/KEYS"
 GPG_KEY_SERVERS="keyserver hkp://keyserver.ubuntu.com:80
@@ -33,7 +32,7 @@ fi
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/node/feature.json b/src/node/devcontainer-feature.json
index fdb29cb..8d3bda6 100644
--- a/src/node/feature.json
+++ b/src/node/devcontainer-feature.json
@@ -4,24 +4,33 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": [ "lts", "latest", "none", "18", "16", "14" ],
+            "proposals": [
+                "lts",
+                "latest",
+                "none",
+                "18",
+                "16",
+                "14"
+            ],
             "default": "lts",
             "description": "Select or enter a Node.js version to install"
         },
-        "nodeGypDependencies": {
+        "install_tools_for_node_gyp": {
             "type": "boolean",
             "default": true,
             "description": "Install dependencies to compile native node modules (node-gyp)?"
         },
-        "nvmInstallPath": {
+        "nvm_install_path": {
             "type": "string",
             "default": "/usr/local/share/nvm",
             "description": "The path where NVM will be installed."
         }
     },
-    "extensions": ["dbaeumer.vscode-eslint"],
+    "extensions": [
+        "dbaeumer.vscode-eslint"
+    ],
     "containerEnv": {
-        "NVM_DIR":"/usr/local/share/nvm",
+        "NVM_DIR": "/usr/local/share/nvm",
         "NVM_SYMLINK_CURRENT": "true",
         "PATH": "${NVM_DIR}/current/bin:${PATH}"
     },
diff --git a/src/node/install.sh b/src/node/install.sh
index 0b2190b..bb71c64 100644
--- a/src/node/install.sh
+++ b/src/node/install.sh
@@ -6,14 +6,14 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/node.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./node-debian.sh [directory to install nvm] [node version to install (use "none" to skip)] [non-root user] [Update rc files flag] [install node-gyp deps]
 
-export NVM_DIR=${1:-"/usr/local/share/nvm"}
-export NODE_VERSION=${2:-"lts"}
-USERNAME=${3:-"automatic"}
-UPDATE_RC=${4:-"true"}
-INSTALL_TOOLS_FOR_NODE_GYP="${5:-true}"
+export NODE_VERSION=${VERSION:-"lts"}
+export NVM_DIR=${NVM_INSTALL_PATH:-"/usr/local/share/nvm"}
+INSTALL_TOOLS_FOR_NODE_GYP="${INSTALL_TOOLS_FOR_NODE_GYP:-true}"
+
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
+
 export NVM_VERSION="0.38.0"
 
 set -e
@@ -32,7 +32,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/oryx/devcontainer-feature.json b/src/oryx/devcontainer-feature.json
new file mode 100644
index 0000000..c526893
--- /dev/null
+++ b/src/oryx/devcontainer-feature.json
@@ -0,0 +1,14 @@
+{
+    "id": "oryx",
+    "name": "Oryx",
+    "containerEnv": {
+        "PATH": "usr/local/oryx:${PATH}",
+        "ORYX_SDK_STORAGE_BASE_URL": "https://oryx-cdn.microsoft.io",
+        "ENABLE_DYNAMIC_INSTALL": "true",
+        "DYNAMIC_INSTALL_ROOT_DIR": "/usr/local"
+    },
+    "install": {
+        "app": "",
+        "file": "install.sh"
+    }
+}
+\ No newline at end of file
diff --git a/src/oryx/feature.json b/src/oryx/feature.json
deleted file mode 100644
index 10a468b..0000000
--- a/src/oryx/feature.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-    "id": "oryx",
-    "name": "Oryx",
-    "containerEnv": {
-        "PATH":"usr/local/oryx:${PATH}",
-        "ORYX_SDK_STORAGE_BASE_URL":"https://oryx-cdn.microsoft.io",
-        "ENABLE_DYNAMIC_INSTALL":"true",
-        "DYNAMIC_INSTALL_ROOT_DIR":"/usr/local"
-    },
-    "install": {
-        "app": "",
-        "file": "install.sh"
-    }
-}
-\ No newline at end of file
diff --git a/src/oryx/install.sh b/src/oryx/install.sh
index 22c12d8..bdbe395 100755
--- a/src/oryx/install.sh
+++ b/src/oryx/install.sh
@@ -6,11 +6,9 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/hugo.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./oryx-debian.sh [Non-root user]
 
-USERNAME=${1:-"automatic"}
-UPDATE_RC=${2:-"true"}
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
 
 set -eu
 
@@ -28,7 +26,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/php/feature.json b/src/php/devcontainer-feature.json
index 4c5dcac..2832eb1 100644
--- a/src/php/feature.json
+++ b/src/php/devcontainer-feature.json
@@ -4,19 +4,22 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": ["latest", "8.0.16"],
+            "proposals": [
+                "latest",
+                "8.0.16"
+            ],
             "default": "latest",
             "description": "Select or enter a PHP version"
         },
-        "installComposer": {
+        "install_composer": {
             "type": "boolean",
             "default": true,
             "description": "Install PHP Composer?"
         },
-        "overrideDefaultVersion": {
-          "type": "boolean",
-          "default": "true",
-          "description": "If true, overrides existing version (if any) of dotnet on the PATH"
+        "override_default_version": {
+            "type": "boolean",
+            "default": "true",
+            "description": "If true, overrides existing version (if any) of dotnet on the PATH"
         }
     },
     "extensions": [
@@ -27,7 +30,7 @@
     ],
     "containerEnv": {
         "PHP_PATH": "/usr/local/php/current",
-        "PATH":"${PHP_PATH}:${PHP_PATH}/bin:${PATH}"
+        "PATH": "${PHP_PATH}:${PHP_PATH}/bin:${PATH}"
     },
     "install": {
         "app": "",
diff --git a/src/php/install.sh b/src/php/install.sh
index 125460d..7da6cb8 100644
--- a/src/php/install.sh
+++ b/src/php/install.sh
@@ -5,17 +5,17 @@
 #-------------------------------------------------------------------------------------------------------------
 #
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./php-debian.sh [PHP version] [PHP_DIR] [Add Composer flag] [Non-root user] [Add rc files flag]
-
-VERSION=${1:-"latest"}
-export PHP_DIR=${2:-"/usr/local/php"}
-INSTALL_COMPOSER=${3:-"true"}
-USERNAME=${4:-"automatic"}
-UPDATE_RC=${5:-"true"}
-OVERRIDE_DEFAULT_VERSION=${6:-"true"}
 
 set -eux
+
+VERSION=${VERSION:-"latest"}
+INSTALL_COMPOSER=${INSTALL_COMPOSER:-"true"}
+OVERRIDE_DEFAULT_VERSION=${OVERRIDE_DEFAULT_VERSION:-"true"}
+
+export PHP_DIR=${PHP_DIR:-"/usr/local/php"}
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
+
 export DEBIAN_FRONTEND=noninteractive
 
 if [ "$(id -u)" -ne 0 ]; then
@@ -33,7 +33,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/powershell/feature.json b/src/powershell/devcontainer-feature.json
index 842a629..07e838f 100644
--- a/src/powershell/feature.json
+++ b/src/powershell/devcontainer-feature.json
@@ -4,7 +4,11 @@
     "options": {
         "version": {
             "type": "string",
-            "proposals": ["latest", "none", "7.1"],
+            "proposals": [
+                "latest",
+                "none",
+                "7.1"
+            ],
             "default": "latest",
             "description": "Select or enter a version of PowerShell."
         }
diff --git a/src/powershell/install.sh b/src/powershell/install.sh
index b8630c4..be60201 100644
--- a/src/powershell/install.sh
+++ b/src/powershell/install.sh
@@ -6,12 +6,11 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/powershell.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./powershell-debian.sh [version]
 
 set -e
 
-POWERSHELL_VERSION=${1:-"latest"}
+POWERSHELL_VERSION=${VERSION:-"latest"}
+
 MICROSOFT_GPG_KEYS_URI="https://packages.microsoft.com/keys/microsoft.asc"
 POWERSHELL_ARCHIVE_ARCHITECTURES="amd64"
 POWERSHELL_ARCHIVE_VERSION_CODENAMES="stretch buster bionic focal"
diff --git a/src/python/feature.json b/src/python/devcontainer-feature.json
index 9f8543c..238b8d1 100644
--- a/src/python/feature.json
+++ b/src/python/devcontainer-feature.json
@@ -18,7 +18,7 @@
       "default": "os-provided",
       "description": "Select a Python version to install."
     },
-    "installTools": {
+    "install_python_tools": {
       "type": "boolean",
       "default": true,
       "description": "Install common Python tools like pylint"
@@ -33,12 +33,7 @@
       "default": "/usr/local/python",
       "description": "The path where python will be installed."
     },
-    "setup_links": {
-      "type": "boolean",
-      "default": "true",
-      "description": "If links and aliases should be created."
-    },
-    "overrideDefaultVersion": {
+    "override_default_version": {
       "type": "boolean",
       "default": "true",
       "description": "If true, overrides existing version (if any) of python on the PATH"
diff --git a/src/python/install.sh b/src/python/install.sh
index ba0aa0a..ed273c0 100755
--- a/src/python/install.sh
+++ b/src/python/install.sh
@@ -6,18 +6,18 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/python.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./python-debian.sh [Python Version] [Python intall path] [PIPX_HOME] [non-root user] [Update rc files flag] [install tools flag] [Use Oryx if available flag] [Optimize when building from source flag]
-
-PYTHON_VERSION=${1:-"latest"} # 'system' checks the base image first, else installs 'latest'
-PYTHON_INSTALL_PATH=${2:-"/usr/local/python"}
-export PIPX_HOME=${3:-"/usr/local/py-utils"}
-USERNAME=${4:-"automatic"}
-UPDATE_RC=${5:-"true"}
-INSTALL_PYTHON_TOOLS=${6:-"true"}
-USE_ORYX_IF_AVAILABLE=${7:-"true"}
-OPTIMIZE_BUILD_FROM_SOURCE=${8-"false"}
-OVERRIDE_DEFAULT_VERSION=${9:-"true"}
+
+PYTHON_VERSION=${VERSION:-"latest"} # 'system' checks the base image first, else installs 'latest'
+INSTALL_PYTHON_TOOLS=${INSTALL_PYTHON_TOOLS:-"true"}
+OPTIMIZE_BUILD_FROM_SOURCE=${OPTIMIZE:-"false"}
+PYTHON_INSTALL_PATH=${INSTALL_PATH:-"/usr/local/python"}
+OVERRIDE_DEFAULT_VERSION=${OVERRIDE_DEFAULT_VERSION:-"true"}
+
+export PIPX_HOME=${PIPX_HOME:-"/usr/local/py-utils"}
+
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
+USE_ORYX_IF_AVAILABLE=${USE_ORYX_IF_AVAILABLE:-"true"}
 
 DEFAULT_UTILS=("pylint" "flake8" "autopep8" "black" "yapf" "mypy" "pydocstyle" "pycodestyle" "bandit" "pipenv" "virtualenv")
 PYTHON_SOURCE_GPG_KEYS="64E628F8D684696D B26995E310250568 2D347EA6AA65421D FB9921286F5E1540 3A5CA953F73C700D 04C367C218ADD4FF 0EDDC5F26A45C816 6AF053F07D9DC8D2 C9BE28DEE6DF025C 126EB563A74B06BF D9866941EA5BBD71 ED9D77D5"
@@ -41,7 +41,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
@@ -365,7 +365,7 @@ if ! type pipx > /dev/null 2>&1; then
     /tmp/pip-tmp/bin/pipx install --pip-args=--no-cache-dir pipx
     pipx_path="/tmp/pip-tmp/bin/"
 fi
-for util in ${DEFAULT_UTILS[@]}; do
+for util in "${DEFAULT_UTILS[@]}"; do
     if ! type ${util} > /dev/null 2>&1; then
         ${pipx_path}pipx install --system-site-packages --pip-args '--no-cache-dir --force-reinstall' ${util}
     else
diff --git a/src/ruby/feature.json b/src/ruby/devcontainer-feature.json
index 919cf47..919cf47 100644
--- a/src/ruby/feature.json
+++ b/src/ruby/devcontainer-feature.json
diff --git a/src/ruby/install.sh b/src/ruby/install.sh
index 3d3edbc..2e9b37a 100644
--- a/src/ruby/install.sh
+++ b/src/ruby/install.sh
@@ -6,13 +6,12 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/ruby.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./ruby-debian.sh [Ruby version] [non-root user] [Add to rc files flag] [Install tools flag]
 
-RUBY_VERSION=${1:-"latest"}
-USERNAME=${2:-"automatic"}
-UPDATE_RC=${3:-"true"}
-INSTALL_RUBY_TOOLS=${6:-"true"}
+RUBY_VERSION=${VERSION:-"latest"}
+
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
+INSTALL_RUBY_TOOLS=${INSTALL_RUBY_TOOLS:-"true"}
 
 # Note: ruby-debug-ide will install the right version of debase if missing and
 # installing debase directly fails on Ruby 3.1.0 as of 1/7/2022, so omitting.
@@ -39,7 +38,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/rust/feature.json b/src/rust/devcontainer-feature.json
index 147969f..147969f 100644
--- a/src/rust/feature.json
+++ b/src/rust/devcontainer-feature.json
diff --git a/src/rust/install.sh b/src/rust/install.sh
index 1d90b14..07a36a7 100644
--- a/src/rust/install.sh
+++ b/src/rust/install.sh
@@ -6,16 +6,15 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/rust.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./rust-debian.sh [CARGO_HOME] [RUSTUP_HOME] [non-root user] [add CARGO/RUSTUP_HOME to rc files flag] [whether to update rust] [Rust version] [rustup install profile]
 
-export CARGO_HOME=${1:-"/usr/local/cargo"}
-export RUSTUP_HOME=${2:-"/usr/local/rustup"}
-USERNAME=${3:-"automatic"}
-UPDATE_RC=${4:-"true"}
-UPDATE_RUST=${5:-"false"}
-RUST_VERSION=${6:-"latest"}
-RUSTUP_PROFILE=${7:-"minimal"}
+RUST_VERSION=${VERSION:-"latest"}
+RUSTUP_PROFILE=${PROFILE:-"minimal"}
+
+export CARGO_HOME=${CARGO_HOME:-"/usr/local/cargo"}
+export RUSTUP_HOME=${RUSTUP_HOME:-"/usr/local/rustup"}
+USERNAME=${USERNAME:-"automatic"}
+UPDATE_RC=${UPDATE_RC:-"true"}
+UPDATE_RUST=${UPDATE_RUST:-"false"}
 
 set -e
 
@@ -33,7 +32,7 @@ chmod +x /etc/profile.d/00-restore-env.sh
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/sshd/feature.json b/src/sshd/devcontainer-feature.json
index 4de71d9..4de71d9 100644
--- a/src/sshd/feature.json
+++ b/src/sshd/devcontainer-feature.json
diff --git a/src/sshd/install.sh b/src/sshd/install.sh
index 3e8d2ec..4ee7893 100644
--- a/src/sshd/install.sh
+++ b/src/sshd/install.sh
@@ -7,15 +7,13 @@
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/sshd.md
 # Maintainer: The VS Code and Codespaces Teams
 #
-# Syntax: ./sshd-debian.sh [SSH Port (don't use 22)] [non-root user] [start sshd now flag] [new password for user] [fix environment flag]
-#
 # Note: You can change your user's password with "sudo passwd $(whoami)" (or just "passwd" if running as root).
 
-SSHD_PORT=${1:-"2222"}
-USERNAME=${2:-"automatic"}
-START_SSHD=${3:-"false"}
-NEW_PASSWORD=${4:-"skip"}
-FIX_ENVIRONMENT=${5:-"true"}
+SSHD_PORT=${SSHD_PORT:-"2222"}
+USERNAME=${USERNAME:-"automatic"}
+START_SSHD=${START_SSHD:-"false"}
+NEW_PASSWORD=${NEW_PASSWORD:-"skip"}
+FIX_ENVIRONMENT=${FIX_ENVIRONMENT:-"true"}
 
 set -e
 
@@ -28,7 +26,7 @@ fi
 if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
     USERNAME=""
     POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
-    for CURRENT_USER in ${POSSIBLE_USERS[@]}; do
+    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
         if id -u ${CURRENT_USER} > /dev/null 2>&1; then
             USERNAME=${CURRENT_USER}
             break
diff --git a/src/terraform/feature.json b/src/terraform/devcontainer-feature.json
index 8af83a7..8af83a7 100644
--- a/src/terraform/feature.json
+++ b/src/terraform/devcontainer-feature.json
diff --git a/src/terraform/install.sh b/src/terraform/install.sh
index f2614ae..3368374 100644
--- a/src/terraform/install.sh
+++ b/src/terraform/install.sh
@@ -6,17 +6,16 @@
 #
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/terraform.md
 # Maintainer: The VS Code and Codespaces Teams
-#
-# Syntax: ./terraform-debian.sh [terraform version] [tflint version] [terragrunt version] [terraform SHA] [tflint SHA] [terragrunt SHA]
 
 set -e
 
-TERRAFORM_VERSION="${1:-"latest"}"
-TFLINT_VERSION="${2:-"latest"}"
-TERRAGRUNT_VERSION="${3:-"latest"}"
-TERRAFORM_SHA256="${4:-"automatic"}"
-TFLINT_SHA256="${5:-"automatic"}"
-TERRAGRUNT_SHA256="${6:-"automatic"}"
+TERRAFORM_VERSION="${VERSION:-"latest"}"
+TFLINT_VERSION="${TFLINT:-"latest"}"
+TERRAGRUNT_VERSION="${TERRAGRUNT:-"latest"}"
+
+TERRAFORM_SHA256="${TERRAFORM_SHA256:-"automatic"}"
+TFLINT_SHA256="${TFLINT_SHA256:-"automatic"}"
+TERRAGRUNT_SHA256="${TERRAGRUNT_SHA256:-"automatic"}"
 
 TERRAFORM_GPG_KEY="72D7468F"
 TFLINT_GPG_KEY_URI="https://raw.githubusercontent.com/terraform-linters/tflint/master/8CE69160EB3F2FE9.key"