Passing arguments before running
We can pass parameters just after the name of the script while running the bash interpreter command. You can pass parameters or arguments to the file. Just the command for running the script normally by adding the value of the parameters directly to the script. Every parameter is a space-separated value to pass to the shell script.
bash scriptname.sh
The above command will just run the script without passing the parameters.
Whereas the command below will pass the arguments to the script.
bash scriptname.sh parameter1 parameter2 parameter3 nth-parameter
Running bash script with passing parameters
The above screenshot displays the parameters passed to the script, how we’ll do that, which we’ll explain in the next section. But right now we can see we have passed in the parameters from outside of the script using bash environment variables. You can even use strings and other data types but beware of any whitespace. White space will make the variable a separate parameter. So, for strings especially, be careful to strictly surround them with quotation marks.
How To Pass and Parse Linux Bash Script Arguments and Parameters
Parsing and Passing of Arguments into bash scripts/ shell scripts is quite similar to the way in which we pass arguments to the functions inside Bash scripts. We’ll see the actual process of passing on the arguments to a script and also look at the way to access those arguments inside the script.