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 2.4 `grep' Programs
 ===================
 
 `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 four major variants of `grep', controlled by the following
 options.
 
 `-G'
 `--basic-regexp'
      Interpret the pattern as a basic regular expression (BRE).  This
      is the default.
 
 `-E'
 `--extended-regexp'
      Interpret the pattern as an extended regular expression (ERE).
      (`-E' is specified by POSIX.)
 
 `-F'
 `--fixed-strings'
      Interpret the pattern as a list of fixed strings, separated by
      newlines, any of which is to be matched.  (`-F' is specified by
      POSIX.)
 
 `-P'
 `--perl-regexp'
      Interpret the pattern as a Perl regular expression.  This is
      highly experimental and `grep -P' may warn of unimplemented
      features.
 
 
    In addition, two variant programs `egrep' and `fgrep' are available.
 `egrep' is the same as `grep -E'.  `fgrep' is the same as `grep -F'.
 Direct invocation as either `egrep' or `fgrep' is deprecated, but is
 provided to allow historical applications that rely on them to run
 unmodified.
 

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