asciinema - Terminal session recorder

asciinema [as-kee-nuh-muh] is a free and open source solution for recording terminal sessions and sharing them on the web. Forget screen recording apps and blurry video. Enjoy a lightweight, purely text-based approach to terminal recording.

When you run asciinema rec in your terminal the recording starts, capturing all output that is being printed to your terminal while you’re issuing the shell commands. When the recording finishes (by hitting Ctrl-D or typing exit) then the captured output is uploaded to asciinema.org website and prepared for playback on the web.