Enable Touch ID on macOS terminal applications

enable-terminal-touch-id.sh

#!/usr/bin/env sh

PAM_SUDO_FILE="/private/etc/pam.d/sudo"
PAM_TID="auth       sufficient     pam_tid.so"

if [ "$(uname)" != "Darwin" ]; then
    echo "[ERROR]: Not on macOS. Exiting..."
    exit 1
fi

grep -F "${PAM_TID}" ${PAM_SUDO_FILE} >/dev/null

if [ ${?} -ne 1 ]; then
    echo "[WARNING]: ${PAM_SUDO_FILE} already contains pam_tid.so entry. Exiting..."
    exit 1
fi

sudo chmod 644 ${PAM_SUDO_FILE}
sudo sed -i '.bak' "1a\\
${PAM_TID}
" "${PAM_SUDO_FILE}"

if [ ${?} -ne 0 ]; then
    echo "[ERROR]: Unable to add pam_tid.so entry to ${PAM_SUDO_FILE}. Exiting..."
    exit 1
fi

sudo chmod 444 ${PAM_SUDO_FILE}
echo "[SUCCESS]: pam_tid.so entry added to ${PAM_SUDO_FILE}."
printf "\n"
cat ${PAM_SUDO_FILE}
printf "\n"

if [ -d '/Applications/iTerm.app' ] || [ -d "${HOME}/Applications/iTerm.app" ]; then
    echo "Checking iTerm.app Touch ID support configuration..."
    PREFERENCE=$(defaults read com.googlecode.iterm2 BootstrapDaemon 2>/dev/null)
    if [ "${PREFERENCE}" = "0" ]; then
        echo "[SUCCESS]: iTerm.app is already configured properly to support Touch ID."
    else
        echo "[WARNING]: Setting iTerm.app preferences via 'defaults write' may not work while iTerm.app is running."
        echo "[WARNING]: Be sure to disable this setting in iTerm's Preferences to enable Touch ID:"
        echo "    Preferences » Advanced » 'Allow sessions to survive logging out and back in'"
    fi
fi

exit 0