 Today we are going to have a very very short video. We're gonna look at the values of certain variables if you want in Bash scripting or shell scripting in general here. We have a dollar sign zero dollar sign one two asterisk at sign Dollar sign dollar sign dollar sign question mark. So what are they that you know? Dollar sign zero is the name of the current script or program running Dollar sign one would be your first argument dollar sign two is your second argument so forth so on dollar sign at our asterisk that would be all of your arguments But as a string dollar sign at symbol is the same thing but instead of a string It's an array and then dollar sign dollar sign is the PID or the process ID of the current running script Which is useful if you want to kill the current script Make sure it's completely killed or if you want maybe have a watchdog application to make sure the script keeps running And then dollar sign question mark is the exit status usually either zero or one whether it was successful or failed Of the last command. Let's go ahead and see these in action I'm going to run this script and I got to give it a couple of arguments, right? So I'm gonna say arg one arg two arg three and then we will go like this and that's the name of our script That is the first argument second argument all three arguments as a string as an array the process ID of the script And the exit status of the last command, which was successful. Anyway, this is films by chris.com It's chris with a k. There's a link in the description I'll put this Link to these notes the script in the description as well. And as always, I hope that you have a great day