I already asked that but had no response: how can I make animated GIF from my screen, like a sequence of screenshots? I'm under Linux

Nooo, I mean a record of my screen (like a video, but in GIF format)

... Thanks but I know how to make GIFs manually! I want an automatic screen recorder.
I could already make a loop that takes screenshots, and then convert to GIF using Gimp, but I'd like to make it manually, better if from command line (no GUI), and eventually cropping the record on a single window.

With THAT query, all results are for Windows, and specifying Linux doesn't bring any good results. I'm not so noob to don't know to search things before asking (I mean, I already searched before posting)

ALREADY TRIED!!!!!!!!!!!!! No good results.
I got video recorders (AVIs, not GIFs), GIF recorders but for Windows, trial programs (for Win too) etc...