Minimal bash script template

boostrap.sh

#!/usr/bin/env bash

# Original version: https://betterdev.blog/minimal-safe-bash-script-template/
# Minor adjustments for positional arguments, debug output, remove colors and such.

set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

#script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)
script_name=$(basename "${BASH_SOURCE[0]}")

usage() {
    cat <<EOF
Usage: ${script_name} [-h] [-v] [-f] -p param_value arg1 [arg2...]

Script description here.

Available options:

-h, --help      Print this help and exit
-v, --verbose   Print script debug info
-f, --flag      Some flag description
-p, --param     Some param description
EOF
    exit
}

cleanup() {
    trap - SIGINT SIGTERM ERR EXIT
    # script cleanup here
}

msg() {
    echo >&2 -e "${1-}"
}

die() {
    msg "$1"
    exit "${2-1}"
}

parse_params() {
    # default values of variables set from arguments and options
    args=()

    while (( $# > 0 )); do
        case "${1-}" in
        --help | -h) usage ;;
        --verbose | -v)
            VERBOSE=1
            set -x
            ;;
        -?*) die "Unknown option: $1" ;;
        *)
            args+=("${1-}")
            ;;
        esac
        shift
    done

    # check required options
    # [[ -z "${param-}" ]] && die "Missing required parameter: param"

    # check required arguments
    # (( ${#args[@]} < 2 )) && die "${script_name} expects 2 arguments, got ${#args[@]}" 1

    # restore arguments
    set -- "${args[@]}"

    return 0
}

parse_params "$@"

# script logic here

if [[ -v VERBOSE ]]; then
    msg "- arguments: ${args[*]-}"
fi