## Shell Script Help Function
#!/bin/bash ### ### my-script — does one thing well ### ### Usage: ### my-script <input> <output> ### ### Options: ### <input> Input file to read. ### <output> Output file to write. Use '-' for stdout. ### -h Show this message. help() { awk -F'### ' '/^###/ { print $2 }' "$0" } if [[ $# == 0 ]] || [[ "$1" == "-h" ]]; then help exit 1 fi echo Hello World