The eval command allows you to run the contents of variables as commands and can be very useful -- especially in scripts.

If you administer multiple Linux servers, Jack Wallen has an easy script you can use to run commands on all of those servers at once.

The steps described above are manifest in the following six commands: $ mkdir scripts $ cd scripts $ touch script.sh $ echo 'echo hello-world' >> script.sh $ chmod -R 777 . $ ./script.sh hello-world ...

To run commands simultaneously or in parallel, use the ampersand (&). However, keep in mind that using an ampersand sends the process to the background, allowing the next command to start immediately.

This guide will take you through how to create a shell script using multiple text editors, how to add comments, and how to use Shell variables. But before heading over to creating a shell script, ...