Simple access to arguments

In shell scripts one can access first argument with $1, The same way one can get second, third, etc. For example, create the following script script1.sh.

#!/bin/sh 

first_argument=$1
second_argument=$2


echo $first_argument
echo $second_argument

In shell add execute permissions for the script by running

chmod u+x script1.sh

Then you can run

./script1.sh arg1 arg2

Access to unknown number of argument

Create script2.sh with

#!/bin/sh

for argument in "$@"
do
    echo $argument
done

Then you can run

./script1.sh arg1 arg2 arg3 arg4

Simple keywords arguments

Now we would like to be able to have a scrip that can interpret the following:

./script3.sh --arg1=123 --arg2=234

This can be easily piping command cut with echo. Create the following script and call it script3.sh

#!/bin/sh

for keyword in "$@"
do
    key=$(echo $keyword| cut -d = -f 1)
    word=$(echo $keyword| cut -d = -f 2)

    echo $key
    echo $word
done

Now call it with

./script3.sh --arg1=123 --arg2=234

Updated: 2020-01-07