Bash Script Template

bashTemplate.sh

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

#/ Usage:
#/ Version: 
#/ Description:
#/ Examples:
#/ Options:
#/   --help: Display this help message
usage() { grep '^#/' "$0" | cut -c4- ; exit 0 ; }
expr "$*" : ".*--help" > /dev/null && usage

LOG_FILE="/tmp/$(basename "$0").log"
readonly LOG_FILE
LOG_TIMESTAMP_FORMAT='+%Y-%m-%d %H:%M:%S'
info()    { echo "$(date $LOG_TIMESTAMP_FORMAT) [INFO]    $*" | tee -a "$LOG_FILE" >&2 ; }
warning() { echo "$(date $LOG_TIMESTAMP_FORMAT) [WARNING] $*" | tee -a "$LOG_FILE" >&2 ; }
error()   { echo "$(date $LOG_TIMESTAMP_FORMAT) [ERROR]   $*" | tee -a "$LOG_FILE" >&2 ; }
fatal()   { echo "$(date $LOG_TIMESTAMP_FORMAT) [FATAL]   $*" | tee -a "$LOG_FILE" >&2 ; exit 1 ; }

cleanup() {
    # Remove temporary files
    # Restart services
    # ...
    return 0 # provided to allow clean-up to exist in template w/o causing errors while empty
}

# Parse Parameters #
UNCONSUMED=()
while [ "$#" -gt 1 ];
  do
  key="$1"
  case $key in
#/   --discovery (-d): An example argument used to show how options are passed to the script.
      -d|--discovery)
      discovery_period="$2" # EXAMPLE
      shift
      ;;
#/   --default: An example argument used to show how an option without a short option or value is coded.
      --default)
      default=YES
      ;;
      *)
#/   Note: arguments without options are ignored without extra handling programmed
      ;;
  esac
  shift
done
set -- ${UNCONSUMED[@]}  # UNCONSUMED becomes our new $@

if [[ "${BASH_SOURCE[0]}" = "$0" ]]; then
    trap cleanup EXIT
    # Script goes here
    # ...
fi

Information on parsing command arguments and options was guided by this:
https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash/14203146#14203146