(grep.info.gz) Invoking

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

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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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