Template bash script file

bash_script.sh

#!/bin/bash

# Exit immediately if command returns a non-zero status.
# Do not move it to shebang since it will be ignored
# if run by "/bin/bash ./bash_script.sh"
set -e

# No arguments are expected, so exit with an error if anything is provided
# https://unix.stackexchange.com/a/25947
if [ ! $# -eq 0 ];
then
  echo "Unexpected arguments: '$*'"
  exit 1
fi

# Self location helper variables
# https://stackoverflow.com/a/68359914
THIS_SCRIPT_PATH="${BASH_SOURCE:-$0}"
THIS_SCRIPT_DIR="`dirname "${THIS_SCRIPT_PATH}"`"

# Sanity check
# Note:
#   If it's a symbolic link, it will only work
#   if the symbolic link name is the same
EXPECTED_FILE="${THIS_SCRIPT_DIR}/bash_script.sh"
if [ ! -r "${EXPECTED_FILE}" ];
then
  echo "File not found: ${EXPECTED_FILE}"
  exit 1
fi

echo "Hello, world!"