Good intro to how UNIX handles multiple processes as well as overview of basic tools every UNIX user knows to manipulate them.
Unix processes
here.
Speaking Unix (all links)
here.
Other topics include:
Speaking UNIX, Part 1: Command the power of the command line
Learn the basics of the UNIX shell and discover how you can use the command line to combine the finite set of UNIX utilities into innumerable data transforms. Articles 07 Mar 2006
Speaking UNIX, Part 2: Working smarter, not harder
Learn how to leverage the many shortcuts that the UNIX(R) shell provides. With a little practice, you'll work smarter, not harder. Articles 08 Aug 2006
Speaking UNIX, Part 3: Do everything right from the command line
Discover three essential UNIX(R) utilities that deliver the entire Internet to your command line. Articles 05 Sep 2006
Speaking UNIX, Part 4: UNIX ownership and permissions provide for privacy and participation
Learn how to manipulate file permissions to protect your files, or share them with others. Articles 17 Oct 2006
Speaking UNIX, Part 5: Data, data everywhere
Take a look at several techniques that illustrate how to move files among systems and how to keep such far-flung data in sync. Articles 28 Nov 2006
Speaking UNIX, Part 6: Automate, automate, automate!
Discover how shell scripts can mechanize virtually any personal or system task. Scripts can monitor, archive, update, report, upload, and download. Indeed, no job is too small or too great for a script. Here's an introduction. Articles 03 Jan 2007
Speaking UNIX, Part 7: Command-line locution
UNIX(R) has a dialect all its own, and its vocabulary of commands is quite large. But you don't have to learn everything all at once. Here, discover more command-line combinations and expand your mastery of the UNIX language. Articles 06 Feb 2007
Speaking UNIX, Part 8: UNIX processes
On UNIX(R) systems, each system and end-user task is contained within a process. The system creates new processes all the time, and processes die when a task finishes or something unexpected happens. Here, learn how to control processes and use a number of commands to peer into your system. Articles 03 Apr 2007
-- Tom