Bash script starter template

bash-cli-starter-template.sh

#!/bin/bash

verbosity=1
debug=false

function cmd_foo {
    echo "foo"
}

function cmd_bar {
    echo "bar"
}

function cmd_help {
    echo "Usage: $0 <command>"
    echo
    echo "Commands:"
    echo "  foo   Echo foo"
    echo "  bar   Echo bar"
    echo "  help  Display help message"
}

args=""
cmdname="$1"
shift

for token in "$@"
do
    case $token in
        -q|--quiet)
            verbosity=0
            ;;
        -v|--verbose)
            verbosity=2
            ;;
        -d|--debug)
            debug=true
            set -x
            ;;
        -*)
            echo -e "\e[31m[error]\e[0m Unknown option $token"
            exit
            ;;
        *)
            args="$arguments $token"
            ;;
    esac
done

if type cmd_$cmdname > /dev/null 2>&1
then
    if [[ "$debug" = true ]]
    then
        echo "Command $cmdname"
    fi
    cmd_$cmdname $args
else
    cmd_help
    exit 1
fi