Your Internet Consultant - The FAQs of Life Online
Note: You didn't ask, but in case you were wondering,
you can compress a file by typing compress filename. The program will
compress your file, add the .Z extension, and delete the original file.
Further, if you type compress filename and it's already compressed, the
program is smart enough to figure that out, add the .Z suffix, and uncompress
it! Pretty handy, eh?