Bash template

myscript

#!/usr/bin/env bash
set -euo pipefail
IFS=$' \n\t'

# To source a dependency
#. dependency

# Script directory
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

DEFAULT_VALUE="default"

usage() {
  echo -e ""
  echo -e "Usage: \\x1B[1m myscript [-o <option> ] [-d <default>] [-f] [-h]"
  echo -e "\\x1B[0m"
  echo -e "\\tDescription of script"
  echo -e ""
  echo -e "Options:"
  echo -e ""
  echo -e " -o | --option \\t parameter with value"
  echo -e " -d | --default \\t parameter that defaults to $DEFAULT_VALUE"
  echo -e " -f | --flag \\t a flag parameter"
  echo -e " -h | --help \\t show the help"
}

value=$DEFAULT_VALUE
option=
flag=0


while [[ $# -gt 0 ]]
do
key="$1"

  case $key in
    -o | --option )   shift
                      option=$1
                      ;;
    -d | --default )  shift
                      value=$1
                      ;;
    -f | --flag )     flag=1
                      ;;
    -h | --help )     usage
                      exit
                      ;;
    * )               usage
                      exit 1
  esac
  shift
done

readonly LOG_FILE="/tmp/$(basename "$0").log"
section() { text="
###########################################################
# $*
###########################################################
"
 echo "$text" | tee -a "$LOG_FILE" >&2 ; }
info()    { echo "[INFO]    $*" | tee -a "$LOG_FILE" >&2 ; }
warn()    { echo "[WARNING] $*" | tee -a "$LOG_FILE" >&2 ; }
error()   { echo "[ERROR]   $*" | tee -a "$LOG_FILE" >&2 ; }
fatal()   { echo "[FATAL]   $*" | tee -a "$LOG_FILE" >&2 ; exit 1 ; }

cleanup() {
  section Trap
  # Remove temporary files
  # Restart services
  # ...
  info cleaning up
}

if [[ "${BASH_SOURCE[0]}" = "$0" ]]; then
  trap cleanup EXIT
  # Script goes here
  # ...
  section Running Script
  warn "Directory of script $DIR"
  info "value $option"
  info "value $value"
  info "flag $flag"

fi