Shell Tricks

All the varnish programs can be invoked with the single argument --optstring to request their getopt() specification, which simplifies wrapper scripts:

optstring=$(varnishfoo --optstring)

while getopts "$optstring" opt
do
    case $opt in
    n)
        # handle $OPTARG
        ;;
    # handle other options
    *)
        # ignore unneeded options
        ;;
    esac
done

varnishfoo "$@"

# do something with the options