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.

There's a command line tool for running multiple commands on multiple Linux servers at once. Jack Wallen shows you how with Parallel-SSH.

Don’t despair – in those situations, you can run multiple instances of Tomcat on a single GNU/Linux server. Each will use the same binary, but turn to different areas for data.

Providing an option for multiple GNOME terminals within a single window frame, terminator lets you flexibly align your workspace to suit your needs.

It's not hard to create and run a shell script in Linux distros like Ubuntu, but there are a few non-obvious pitfalls you need to avoid. Here's a quick example of how to execute a script in Linux.