BASH: Checking if command line has arguments (@see http://linuxcommand.org/wss0130.php)

testme.sh

#!/bin/bash

function testMe {
	message=$1;
	
	# check if there is an argument given
	if [ "$1" != "" ]; then		
		echo -e "Test Me: $message\n";
	fi	
	
	# check if the variable contains something
	if [ ! -z "$message" ]; then
		echo -e "Hello there: $message\n";
	fi
}