[Bash args] Bash positional arguments and command line options usage #linux #bash

arguments.sh

#see link: http://linuxcommand.org/lc3_wss0120.php

# Positional args
# $#: number of items on the command line in addition to the name of the command
# $0: name of the command


> some_program word1 word2 word3
# $# would be 3
# $0 would contain "some_program"
# $1 would contain "word1"
# $2 would contain "word2"
# $3 would contain "word3"

# Detecting Command Line Arguments
if [ "$1" != "" ]; then
    echo "Positional parameter 1 contains something"
else
    echo "Positional parameter 1 is empty"
fi


if [ $# -gt 0 ]; then
    echo "Your command line contains $# arguments"
else
    echo "Your command line contains no arguments"
fi