shellscript template

shellscript-template.sh

#!/bin/bash

set -eu

function usage {
    cat <<EOF
$(basename ${0}) is a tool for ...

Usage:
  $(basename ${0}) [<options>]

Options:
  --debug, -d       run debug mode
  --version, -v     print $(basename ${0}) version
  --help, -h        print this
EOF
}

function version {
  echo "$(basename ${0}) version 1.0.0"
}

readonly RED=31
readonly GREEN=32
readonly YELLOW=33
readonly BLUE=34

# cecho $RED "hello"
function cecho {
  color=$1
  shift
  echo -e "\033[${color}m$@\033[m"
}

# set option
DEBUG=false
while [ $# -gt 0 ];
do
  case ${1} in
    --debug|-d)
      set -x
      DEBUG=true
      readonly DEBUG
    ;;
    --version|-v)
      version
      exit 0
    ;;
    --help|-h)
      usage
      exit 0
    ;;
    *)
      cecho $RED "[ERROR] Invalid option '${1}'"
      usage
      exit 1
    ;;
  esac
  shift
done

# below program
# alias ls='ls --color=always'