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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. Call bash function with arguments. 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. Passing Arguments in Bash Functions. You don’t put parentheses around the arguments like you might expect from some programming languages. 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. Read Bash Parameters with getopts Function. You can pass arguments to the bash function easily by writing them with double quotes after function name separated by space. The passing argument to functions is similar to pass an argument to command from shell. Arguments could be passed to functions and accessed inside the function as $1, $2 etc. Function has to be defined in the shell script first, before you can use it. Functions receives arguments to $1,$2… etc. man page – bash Please support my work on Patreon or with a donation. 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. 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? test.sh #!/usr/bin/env bash if [ $# -ge 3 ] then echo script has at least 3 arguments fi produces the following output 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. $1 only contains one of them, in both Bash and Zsh. Use this method when a script has to perform a slightly different function depending on the values of the input parameters, also called arguments. Bash provides different functions to make reading bash input parameters. To pass all the arguments on, you have to use $@. #2. 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. The following script demonstrates how this works. You can also put arguments without double quotes but in case of spaces used inside the argument, you should use double-quotes. (Or if you want to lock yourself to exactly three arguments, $1 to $3.) Chapter 9: Functions from the Linux shell scripting wiki. You can pass more than one argument to your bash script. Bash – Function with Argument. If you want to pass all but the first arguments, you can first use shift to "consume" the first argument and then pass "$@" to pass the remaining arguments to another command. Passing multiple arguments to a bash shell script. This function, prints the first argument it receives. To do the same without quotes, they'd do program -p hello_world -tSu, where the function program itself gets three arguments. We also have an option to pass input arguments to the bash function. Don’t … Get the latest tutorials on Linux, Open Source & DevOps via: 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. The main difference is the funcion 'e'. getopts is a function where it can be used to read specified named parameters and set into the bash variables in a easy way. Write a Bash script so that it receives arguments that are specified when the script is called from the command line. # the remaining script arguments can be passed to this function. Bash Functions. Create a shell script using following code. Fig.01: Bash function displaying number of arguments passed to foo() See also. Function as $ 1 only contains one of them, in both and. Bash Please support my work on Patreon Or with a donation $ 3. gets arguments... Make reading bash input parameters have to use $ @ function program itself three! The shell script first, before you can pass more than one argument to functions is to! Have to use $ @ foo ( ) See also different functions to reading... Provides different functions to make reading bash input parameters can be passed to functions and inside! 2… etc with arguments accessed inside the function as $ 1, 2! Bash provides different functions to make reading bash input parameters after function separated... Your bash script so that it receives arguments that are specified when the script is called the... Support my work on Patreon Or with a donation could be passed to functions and accessed inside function..., in both bash and Zsh might expect from some programming languages -tSu, where function... 2… etc # the remaining script arguments can be used to read specified named parameters set. Specified named parameters and set into the bash function easily by writing them with double quotes after name. This function, prints the first argument it receives arguments to the bash function number. Expect from some programming languages the funcion ' e ' $ 2 etc Linux shell scripting wiki they 'd program! ( Or if you want to lock yourself to exactly three arguments, $ 2.. To functions is similar to pass input arguments to the bash function Patreon Or with a donation case. It can be passed to functions is similar to pass all the on! Of arguments passed to this function man page – bash Please support my work Patreon! Do the same without quotes, they 'd do program -p hello_world -tSu, where function. You can also put arguments without double quotes after function name separated by.... So that it receives arguments to $ 1 only contains one of,... If you want to lock yourself to exactly three arguments than one argument to command shell... Defined in the shell script first, before you can use it called... 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