# This is the testing script! echo “Welcome to the Linux family.” The above example illustrates the usage of the “#” symbol in adding comments in a shell script. Using Shell Variables Variables are a ...

For example, sometimes you may want to run a script or a command whenever you start your Linux machine. There is more than one way to do this.

The main purpose of the execute bit is to control whether or not you can run a file as a program or script. If you enter the name of a file on your command line, your shell will attempt to execute it.

You could even embed an executable file in a script — even another script — and then execute that script which might unpack another script. It boggles the mind.

If you want to get some of the power of Kali Linux on your Ubuntu distribution, Jack Wallen shows you how to do so with the Katoolin install script.