Using shell-based resource monitors

When you install any Linux distribution with a desktop environment, chances are there will be a graphical system monitor bundled along with it. Popular among these are KSysGuard and the GNOME System Monitor, but there are many others. For the most part, these are fine and do the job well. The GNOME System Monitor is capable of showing you your load average, currently running processes (as well as their PID, CPU percent, memory, and more), and how much of your disks are being used. Many graphical system monitors also show this information and more. While these tools are great, nodes within a typical Linux-based network don't always have a graphical user interface available. Thankfully, there are many different resource monitoring tools available via the shell and they don't require that you're running a desktop environment at all. Some of these are so great that you'll, at some point, forego the graphical tools for the shell tools. Popular tools in this...