October 2005
Intermediate to advanced
908 pages
46h 42m
English
A Unix shell defines variables to control the behavior of your Unix session. Setting these variables tells the system, for example, which directory to use as your home directory, or the file in which you store your mail. Some variables are preset by the system; you can define others in startup files that are read when you log in. Startup files can also contain Unix commands or special shell commands. These are executed every time you log in. Many shells also support special variables and internal commands that let you tailor the behavior of the shell itself.
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