merlin-installer.sh

#!/bin/sh
# version: 1.0.0, 22-jul-2022, by eibgrad

# function usage()
usage() {
    echo 'Usage: merlin-installer.sh [options] pastebin-id [pastebin-id ...]'
    echo
    echo '  Download and install merlin script(s).'
    echo
    echo '  Options:'
    echo '    --noexec   do NOT install script(s); only download to stdout'
    echo '    --nocom    remove blank lines and pure/non-functional comments'
    echo '    --comp     same as --nocom, plus remove leading whitespace'
    echo '    --debug    install script(s) w/ debugging mode enabled'
    echo '    -h,--help  this usage information'
    echo
    echo '  Note: use of --nocom or --comp implies --noexec'
    echo
}

# handle -h|--help option
for opt; do case $opt in -h|--help) usage; exit 0;; esac; done

# process command line options
while [ $# -gt 0 ]; do
    case "$1" in
        '--noexec') noexec=;;
         '--nocom') nocom=; unset comp; noexec=;;
          '--comp') comp=; unset nocom; noexec=;;
         '--debug') debug=; export DEBUG=;;
                 *) if echo "$1" | grep -q '^-'; then
                        echo "error: unknown option: $1"; exit 1
                    else
                        break 2
                    fi;;
    esac
    shift
done

[ "$1" ] || { echo "info: nothing to do"; exit 0; }

# configure curl command
CURL="curl -kLs -H 'Cache-Control: no-cache'"

# assume remaining command line arguments are pastebin ids
while [ $# -gt 0 ]; do
    # verify this is a known, supported merlin script
    case "$1" in
        'hvHHic1V') ;; # merlin-ac68u-add-networks.sh
        'AGNF8cC8') ;; # merlin-dns-monitor.sh
        'F2GmyrCC') ;; # merlin-ovpn-client-killswitch.sh
        'wyKu0pww') ;; # merlin-ovpn-client-watchdog.sh
        '9jHRA6DG') ;; # merlin-ovpn-lan2wan-by-domain.sh
        'i8hpNGpq') ;; # merlin-ovpn-plex-pbr.sh
        'SqReWZnB') ;; # merlin-ovpn-port-forward.sh
        'MkKb9tia') ;; # merlin-ovpn-server-restart.sh
        'kTThBV46') ;; # merlin-ovpn-sync-routes.sh
        'MLtSBb6E') ;; # merlin-pptp-gw-override.sh
        'b7p6f102') ;; # merlin-wol-port-forward.sh
                 *) echo "error: file not found: $1"; shift; continue;;
    esac

    # configure url for raw pull (obscure from hosting site)
    url="$(echo wastebin | sed s/w/p/).com/raw/$1"

    if [ ${noexec+x} ]; then
        # retrieve, clean, and dump script to stdout
        if [ ${nocom+x} ]; then
            # remove blank lines and pure/non-functional comments
            $CURL $url | tr -d '\r' | sed -r '/^\s*($|#(\s|#|$))/d'; echo
        elif [ ${comp+x} ]; then
            # same as --nocom, plus remove leading whitespace
            $CURL $url | tr -d '\r' | sed -r 's/^\s*//;/^($|#(\s|#|$))/d'; echo
        else
            $CURL $url | tr -d '\r'; echo
        fi
    else
        # retrieve, clean, and execute the script
        $CURL $url | tr -d '\r' | sh
    fi

    shift
done

exit 0