General

Notice also, that if any option is entered you have to specify the output file with the -o switch.

If you try to save under a filename that already exists, the name will be post-fixed with a number (incremented if that name exists already)

Commands

Record a section

$ recordmydesktop --no-sound -x X_pos -y Y_pos --width WIDTH --height HEIGHT -o foo.ogv
# where X_pos and Y_pos specify the offset in pixels from the upper left
# corner of your screen and WIDTH and HEIGHT the size of the window to be recorded(again in pixels).
# If the area extends beyond your current resolution, you will be notified appropriately and nothing will happen.