The problem with doing a "ps aux" is the same as the problem with "df", but much worse. It gives you far too much output, when you are interested in only a small fraction of it. Fortunately, you can filter out most of the irrelevant information by using a pipe, "|", and the "grep" command. Remember the ">"? It was used to send the output of a command to a file rather than to the screen. Well, the "|" (it's above the "\" on your keyboard) is very similar. The only difference is that it sends the output of a command as the input to another command. In other words, it "pipes" data from one command to another. For example, when we wanted to print out Jester's two joke files, we could have saved ourselves a few steps by typing this cat joke-1 joke-2 | lpr -P zephyr The output of "cat joke-1 joke-2" is sent directly to the printer, rather than to a file. This is a very powerful technique. Click the right arrow.