8.2 Functions with parameters sample #!/bin/bash function quit { exit } function e { echo $1 } e Hello e World quit echo foo This script is almost identically to the previous one. In general, here is the syntax of passing multiple arguments to any bash script: script.sh arg1 arg2 arg3 … The second argument will be referenced by the $2 variable, the third argument is referenced by $3, .. etc. Function has to be defined in the shell script first, before you can use it. Bash Functions – In this Bash Tutorial, we shall learn about functions in Bash Shell Scripting with the help of syntax and examples.. About Bash Functions. Bash – Function with Argument. Fig.01: Bash function displaying number of arguments passed to foo() See also. This function, prints the first argument it receives. #2. Create a shell script using following code. Bash provides different functions to make reading bash input parameters. If you want to pass all but the first arguments, you can first use shift to "consume" the first argument and then pass "$@" to pass the remaining arguments to another command. Put any parameters for a bash function right after the function’s name, separated by whitespace, just like you were invoking any shell script or command. You can pass more than one argument to your bash script. To do the same without quotes, they'd do program -p hello_world -tSu, where the function program itself gets three arguments. Don’t … Chapter 9: Functions from the Linux shell scripting wiki. Arguments could be passed to functions and accessed inside the function as $1, $2 etc. Read Bash Parameters with getopts Function. We also have an option to pass input arguments to the bash function. (Or if you want to lock yourself to exactly three arguments, $1 to $3.) You can pass arguments to the bash function easily by writing them with double quotes after function name separated by space. Get the latest tutorials on Linux, Open Source & DevOps via: man page – bash Please support my work on Patreon or with a donation. test.sh #!/usr/bin/env bash if [ $# -ge 3 ] then echo script has at least 3 arguments fi produces the following output If you'd like to check if the argument exists, you can check if the # of arguments is greater than or equal to your target argument number. getopts is a function where it can be used to read specified named parameters and set into the bash variables in a easy way. Why would you need that you ask? Here is a possible solution that allows you to call a specific function in the script: $ cat functions.sh #!/bin/bash ls2() { echo "Hello World" } ls3() { echo "Testing $*" } # the next line calls the function passed as the first parameter to the script. You can also put arguments without double quotes but in case of spaces used inside the argument, you should use double-quotes. $1 only contains one of them, in both Bash and Zsh. Write a Bash script so that it receives arguments that are specified when the script is called from the command line. Use this method when a script has to perform a slightly different function depending on the values of the input parameters, also called arguments. Passing multiple arguments to a bash shell script. To pass all the arguments on, you have to use $@. Bash Functions. The passing argument to functions is similar to pass an argument to command from shell. Passing Arguments in Bash Functions. Imagine you are trying to write a function to compare two integers but these integers will be provided by end user as command line argument; So how will function access these integer values for comparison? Functions receives arguments to $1,$2… etc. The following script demonstrates how this works. The main difference is the funcion 'e'. getopst will read every input parameter and look for the options to match and if match occrus the parameter value set to given variable name. 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