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[translating] 20150125 A Shell Primer--Master Your Linux OS X Unix Shell...
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A Shell Primer: Master Your Linux, OS X, Unix Shell Environment
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On a Linux or Unix-like systems each user and process runs in a specific environment. An environment includes variables, settings, aliases, functions and more. Following is a very brief introduction to some useful shell environment commands, including examples of how to use each command and setup your own environment to increase productivity in the command prompt.