Recursive decent parsing! For example, here's a template for a script, with a `main` function, parsing for an `--interactive` flag, and handling of positional a

Recursive decent parsing! For example, here's a template for a script, with a `main` function, parsing for an `--interactive` flag, and handling of positional arguments. If you want an option to take an argument, you can simple extend the `case` with a new option, with shift and take `$1`. #!/bin/bash set -eu set -o pipefail set +o posix main() { local interactive=0 local positional=() while [[ $# != 0 ]] ; do if [[ "$1" =~ ^--(.*)$ ]] ; then shift local param param="${BASH_REMATCH[1]}" case ${param} in interactive) interactive=1 ;; *) "invalid parameter ${param}"; return 1 ;; esac else positional+=("$1") shift fi done set -- "${positional[@]}" if [[ "${interactive}" == "1" ]] ; then echo "I am interactive" else echo "I am not interactive" fi echo "Rest of my arguments: "$@ } main "$@"