grep: Invoking

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1 2 Invoking ‘grep’
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1 The general synopsis of the ‘grep’ command line is
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1      grep OPTIONS PATTERN INPUT_FILE_NAMES
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1 There can be zero or more OPTIONS.  PATTERN will only be seen as such
1 (and not as an INPUT_FILE_NAME) if it wasn’t already specified within
1 OPTIONS (by using the ‘-e PATTERN’ or ‘-f FILE’ options).  There can be
1 zero or more INPUT_FILE_NAMES.
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Menu

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· Command-line Options        Short and long names, grouped by category.
· Environment Variables       POSIX, GNU generic, and GNU grep specific.
· Exit Status                 Exit status returned by ‘grep’.
· grep Programs               ‘grep’ programs.
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