Task file in Bash

task.sh

#!/usr/bin/env bash

commands=(
    salute
)

function salute {(
  echo "Hello ${1}!"
)}




function help {
    printf "%s\n" "Available commands:"
    printf " %s\n" "${commands[@]}" help
}

function run-command {
    command="$1"
    for c in "${commands[@]}"; do
        if [ "$c" = "$command" ]; then
            ("$command" "${@:2}")
            return
        fi
    done
    printf "%s\n" "Command '${command}' does not exist."
}

set -euo pipefail
cd "$(dirname "${BASH_SOURCE[0]}")"
[ -z "${1:-""}" ] || [ "${1:-""}" = "help" ] && help && exit 0
run-command "${1}" "${@:2}"