shell scripting playground: command line arguments

play_with_cmdline_arg.sh

#!/bin/bash

[ $# -eq 0 ] && {
    echo give me some arguments!
    exit 0
}

echo $0 $1 ${2:-default_value} ${3:+and a third arg exists!}
echo total number of arguments passed: $#
echo all arguments: $*
printf "all arguments as a single string: %s\n" "$*"
printf "all arguments as a list of seperate strings: %s\n" "$@"
echo loop for each argument and print and pop:
while [ $# -ne 0 ]
do
    printf "\t%s\n" $1
    shift # pop out the first argument, so that $# becomes one less
done
echo now we have no argument left at all! $*