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(grep.info)Grep Programs

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`grep' programs
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   `grep' searches the named input files (or standard input if no files
are named, or the file name `-' is given) for lines containing a match
to the given pattern.  By default, `grep' prints the matching lines.
There are three major variants of `grep', controlled by the following
options.

`-G'
`--basic-regexp'
     Interpret pattern as a basic regular expression.  This is the
     default.

`-E'
`--extended-regexp'
     Interpret pattern as an extended regular expression.

`-F'
`--fixed-strings'
     Interpret pattern as a list of fixed strings, separated by
     newlines, any of which is to be matched.

   In addition, two variant programs EGREP and FGREP are available.
EGREP is the same as `grep -E'.  FGREP is the same as `grep -F'.