On the whole, I use the GUI. However, I use the command line for doing java code without an IDE (as recommended by Ivor Horton in "Beginning Java 2" and other adhoc tasks such as outputting the contents of a folder to a file, checking my Path, checking file attributes, running regedit, changing file extensions. I also run some unix-like utilities at the command line such as grep as windows does still not have anything as good.

Gill BC