Starting a bash script

args.sh

#!/bin/bash

# basic manual argument parsing

usage() {
  echo "Usage: $0 [--foo FOO] [-v]" 1>&2
}

foo=""
verbose=false
while [[ $# -gt 0 ]]; do
  case "$1" in
  --foo)
    shift
    foo="$1"
    shift
    ;;
  -v | --verbose)
    shift
    verbose=true
    ;;
  -help)
    usage
    exit 0
    ;;
  -*)
    usage
    exit 1
    ;;
  *)
    break
    ;;
  esac
done

bash.sh

#!/bin/bash

# set -e exit whenever a command errors
# set -u fails when a variable is undefined (including arguments $1, etc.)
# set -o pipefail fails a pipe when any command fails (this isn't always a good idea)

set -euo pipefail

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

blue=$(tput setaf 4 || printf "")
green=$(tput setaf 2 || printf "")
red=$(tput setaf 1 || printf "")
reset=$(tput sgr0 || printf "")

info() {
  echo -e "${blue}$1${reset}" 
}

error() {
  echo -e "${red}$1${reset}" 1>&2 
}

good() {
  echo -e "${green}$1${reset}" 1>&2 
}