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Tells you the amount of time it took to run that particular process, or how long that process has been running in minutes and seconds. The terminal type the process is running in if you see two question marks ( ?), that means the process is running outside of a Terminal window or display. The command’s process identification number (or PID for short). In the very first line of the information returned, you’ll see PID, TT, STAT, TIME, and COMMAND. Each column in that spreadsheet should have a column head to help define what you see underneath. Think of the headers the same way you would when looking at an Excel spreadsheet with a bunch of columns. When the Terminal displays the results of the ps -ax command, you’ll see that it adds a “header” to the output: $ ps -ax The -ax option tells ps to display all of the programs and processes being run by all of the users (including you and the system, itself) on the system. First off, you’ll see that we added some options (or flags or switches) to the ps command the options are the -ax bit. Okay, now let’s go back and look at the output from running the ps -ax command.
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Of course, the next thing that’s running through your head is “Sure, but what does all that output in the Terminal mean to me, and what do I do with it?” This is the key reason to learn and work with the Unix side of Mac OS X: to really know what your Mac’s doing and be able to make it match what you want and need your Mac to do. That’s more than the few applications Force Quit shows you.
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This chapter sets the stage for the rest of the book, answering the question: “Why use Unix when you have a perfectly good Mac graphical interface?” It’s an important question, and I think that within just a few minutes, you’ll agree that joining the Unix world is really like learning you have a completely separate, and even more powerful, operating system lurking in your machine.įigure 1-1. Force Quit doesn’t show all running applicationsīy contrast, the ps ( processor status) command used from within the Terminal application ( /Applications/Utilities/Terminal) shows a complete and full list of every application, utility, and system process running on your Mac, as shown here: $ ps -axģ1 ? Ss 0:00.56 /usr/sbin/syslogd -m 0 -c 5Ĥ3 ? Ss 0:00.76 /usr/sbin/diskarbitrationd
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Even Apple promotes Mac OS X with the tagline: “The simplicity and elegance of the Mac, and the Power of Unix.” There’s no denying it’s a match made in heaven. One of the greatest pleasures of using Unix within Mac OS X is that you get the benefit of a truly wonderful graphical environment and the underlying power of the Unix command line. All you have to do is command Unix to take action. Lying underneath Mac OS X Tiger’s purring Aqua interface is a powerful Unix system, ready to leap into action at a moment’s notice.
Why would any sane person want to type in a bunch of funny looking Unix commands when you can just use the mouse? After all, Mac OS X has one-if not the- best looking user interface out there, so what would compel you, a Mac user through and through, to use the Unix command line? That’s a tough sell, but you can boil it down to just one word: Power.
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