Opensource.com - https://opensource.com/article/17/11/taking-screen-captures-linux-command-line-scrot
There are great tools on the Linux desktop for taking screen captures, such as KSnapshot and Shutter. Even the simple utility that comes with the GNOME desktop does a pretty good job of capturing screens. But what if you rarely need to take screen captures? Or you use a Linux distribution without a built-in capture tool, or an older computer with limited resources?