Bash Script Boilerplate

bash-boilerplate.sh

#!/bin/bash

set -a ; set -o errexit ; set -o nounset

function usage() {
    cat <<EOF
    Usage: ${0} ARG
    OPTIONS:
      -h        Show usage
EOF
exit
}

while getopts ":h" OPTION; do
  case $OPTION in
    h) usage             ;;
  esac
done

shift $((OPTIND - 1))

if [ $# -eq 0 ]; then
  usage
fi

if [[ ! -f $HOME/.example ]]; then
  printf 'Enter username for Example: '
  read -r EXAMPLE_USER
  printf 'Enter password for Example: '
  read -rs EXAMPLE_PASS
  echo
  echo "${EXAMPLE_USER}:${EXAMPLE_PASS}" \
    > "$HOME/.example"
fi