Bash script with arguments template

template.sh

#!/bin/bash

CWD=`pwd`
SCRIPT_PATH=`readlink -f "$0"`
SCRIPT_DIR=`dirname "$SCRIPT_PATH"`
cd "$SCRIPT_DIR"

# parse options
QUIET=false
OPT_C=false
OPT_P=

function qecho {
    if [[ "$QUIET" == "false" ]]; then
        echo "$@"
    fi
}

while getopts "qcp:" opt; do
  case $opt in

        q)
            QUIET=true
            ;;

        c)
            OPT_C=true
            ;;

        p)
            OPT_P="$OPTARG"
            ;;

        \?)
            echo "invalid option: -$OPTARG"
            cleanExit 1
            ;;

  esac
done

qecho "bash script template"
qecho ""

# exits and cleans up
function cleanExit {
    if [[ "$2" != "" ]]; then
        echo "$2"
    fi

    cd $CWD
    exit $1
}

# exits with option error message
function handleOptionNotFound {
    if [[ "$2" = "" ]]; then
        echo "not found option: $1"
        cleanExit 1
    fi
}

# executed command
function execute {
    qecho "exec> $@"
    $@
}

function execute_quoted {
    qecho "exec> $@"
    "$@"
}

# executed command with no output written
function execute_quiet {
    qecho "exec> $@"
    $@ 2>&1 > /dev/null
}

# load command line arguments
shift $((OPTIND-1))
COMMAND=$1

# execute commands
case "$COMMAND" in

    "help")
        echo "usage: template [OPTIONS] [COMMAND] [ARGUMENTS]"
        echo "-q : quiet mode (no output from this script)"
        echo ""
        ;;

    "example-command")
        qecho "example-command [param=$2]"
        ;;

    *)
        echo "nothing to do, to display help please use: luna help"
        cleanExit 1
        ;;

esac

cleanExit 0