Proper Bash script template

template.sh

#!/usr/bin/env bash

# Inspired on https://sharats.me/posts/shell-script-best-practices/

set -o errexit # if something fails, the script will halt
set -o nounset # if an unset variable is being read, the script will halt
set -o pipefail # if a command in a pipe fails, the script will halt

# Do we want to debug this script?
if [[ "${TRACE-0}" == "1" ]]; then
  set -o xtrace
fi

# Let's go to the script path
cd "$(dirname "$0")"

# Help function
help() {
  # TODO: Add help message here
  echo '
  Usage: '${0}' [--help]
  
  --help: will show this message and exit the program
'
  exit 0
}

# Add your additional functions before "main", if any.
# Main function
main()  {
  # TODO: Add your logic here
  echo "Hello, world!"
  exit 0
}

# Startup logic
if [[ "${1-}" =~ ^-*h(elp)?$ ]]; then
  help "$@"
else
  main "$@"
fi