When writing scripts, it’s important to know how to test and validate variables. You may need to verify that required arguments are provided and that the values match what is needed.

I'm still new to bash scripting, and I'm trying to get a script to work. The other scripts to which this refers, start.sh and stop.sh, work fine, as well as my references to them.

Scripting in Linux–putting commands into a file so you can run them as a group—is a lot easier than running them from the command line because you don’t have to figure out the process over ...

Each of the four numbers has a valid range of 0 to 255. The following bash script contains a bash function which returns true if it is passed a valid IP address and false otherwise. In bash speak true ...