Bash programming/Parsing Command-Line Arguments

Parsing command-line argument can be done at least using three different methods^[1]

Using getopt[s]
Bash Space-Separated (e.g., --option argument) (without getopt[s])
Bash Equals-Separated (e.g., --option=argument) (without getopt[s])

Basic usage template:

#!/bin/bash

program_name=$0

function usage {
    echo "Usage: $program_name [parameter1] [parameter2] [parameter3]"
    echo "  parameter1 - parameter 1 explanation"
    echo "  parameter2 - parameter 2 explanation"
    echo "  Example: $program_name parameter1 parameter2 parameter3"
    exit 1
}

if [ $# == 0 ]; then
 usage
fi