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Passing Arguments to Bash Functions # To pass any number of arguments to the bash function simply put them right after the function’s name, separated by a space. To see these special variables in action; take a look at the following variables.sh bash script: #!/bin/bash echo "Name of the script: $0" echo "Total number of arguments: $#" echo "Values of all the arguments: $@" You can now pass any arguments you want and run the script: Alright, this brings us to the end of this week’s tutorial. Viewed 4k times 1. Our "-f" option requires a valid file name as an argument.We use shift again to get the next item from the command line and assign it to filename.Later we will have to check the content of filename to make sure it is valid.. 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. So now we are able to pass multiple parameters in shell script. Getting Started with Bash Functions. These arguments are specific with the shell script on terminal during the run time. Each variable passed to a shell script at command line are stored in corresponding shell variables including the shell script name. Active 2 years, 7 months ago. Command Line Arguments in Shell Script. But you can use parameters in function by using other variable. Use this method when a script has to perform a slightly different function depending on the values of the input parameters, also called arguments. Integrating the Command Line Processor into the Script. Read parameters. So far we got fair idea about bash functions. Getting an Option's Argument. The shell gives you some easy to use variables to process input parameters: $0 is the script’s name. The shell can read the 9th parameter, which is $9. Command line arguments are also known as positional parameters. $1 is the 1st parameter. This function, prints the first argument it receives. Although aliases are quick and easy to implement, they are quite limited in their scope. Bash provides different functions to make reading bash input parameters. Create function with Parameters: Bash can’t declare function parameter or arguments at the time of function declaration. You’ll find as you’re trying to chain commands together that you can’t access arguments given at runtime very well, among other things. 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. For three arguments # /tmp/collect_input.sh -n 12 -t 34 -c value You entered number as: 12 You entered timeout as: 34 You entered collect as: value. Value returned by function is: 10. Lastly I hope the steps to pass multiple parameters in shell script on Linux was helpful. Read Bash Parameters with getopts Function. Write a Bash script so that it receives arguments that are specified when the script is called from the command line. Let us create logger function which will print date and time along with log message. Logger. Here we send two parameters (3 and 5) to the script. Now let us create some useful bash functions which can be used to make our lives easier. NOTE: In bash we have to use $? Function recipes. Named bash function parameters [duplicate] Ask Question Asked 2 years, 7 months ago. This question already has answers here: Passing named arguments to shell scripts (11 answers) Closed 2 years ago. Aliases can also be quite slow at times because they are read after all functions. So how to read these parameters in our bash script? It is a good practice to double-quote the arguments to avoid the misparsing of an argument with spaces in it. $2 is the 2nd parameter. 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