Video

Coolest way is to use the package recordmydesktop and upload the video to YouTube or something!

Since my desktop is quite large, you might instead record a window:

recordmydesktop --follow-mouse -width 256 -height 256

Text

Want to show someone your work? Try script. It annoyingly has all your errors and frantic backspaces, however I at least find it beneficial.

script mywork

and ctrl-d or exit stops it recording.

History is another command I run very often, try it.

You can also hardcopy and log sessions with screen.