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Learning the UNIX command line course
Mac beginners can easily become power OS X users by using the Terminal to interact with the UNIX shell.
Full course
Over 100 episodes immediately available for download to your Mac
                  $79
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                What you'll learn
- Getting help with man pages
 - Managing files and directories
 - Understanding directory and file permissions
 - Redirection and Pipes
 - Working with Processes
 - Installing software from the command line
 - Features of the UNIX shell