Template for Bash Script.

bash-template

#!/bin/bash
# vi: set ts=4 sw=4 sts=0 et:
# [使いやすいシェルスクリプトを書く | SOTA](http://deeeet.com/writing/2014/05/18/shell-template/)
# [Zsh - シェルスクリプトのオプション設計ガイドライン - Qiita](http://qiita.com/mollifier/items/95a294f95f5977b9d663)

PROG=$(basename ${0})

usage() {
    cat <<EOF
${PROG} is a tool for %FIXME%

Usage:
  ${PROG} [command] [<options>]

Options:
  --debug, -d     print debug messages.
  --verbose, -v   Verbose output.
  --help, -h      print this help.

Example:
  ${PROG} -v
EOF
}

error_exit() {
    [ -z "${1}" ] || echo "${1}"
    echo "Try `${PROG} -h|--help' for more information."
    exit 1
}

# messages
red=31
green=32
yellow=33
blue=34

cecho() {
    color=${1}
    if test -t 1;then
        echo -e "\033[1;${color}m$@"
        tput sgr0
    else
        echo "$@"
    fi
}

okecho() {
    cecho $green "OK: $@"
}

eecho() {
    cecho $red "ERROR: $@"
}

decho() {
    if [ "${DEBUG}" -eq 1 ]; then
        echo "DEBUG: $@"
    fi
}

DEBUG=0
VERBOSE=0
while [ $# -gt 0 ]; do
    case ${1} in
        --debug|-d)
            DEBUG=1
            ;;
        --verbose|-v)
            VERBOSE=1
            ;;
        --help|-h)
            usage
            ;;
        *)
            error_exit "Invalid option '${1}'"
            ;;
    esac
    shift
done