GREP(1)                                                   GREP(1)

     NAME
          grep - pattern matching

     SYNOPSIS
          grep [ -lnviLs ] pattern [ file... ]

     DESCRIPTION
          Grep prints lines from each file that match the pattern, a
          regular expression as defined in regex(2). If no files are
          given, standard input is used.  If more than one file is
          given, each line of output is preceded by the name of the
          file it was found in.  The options are:

          -l        Print only the name of each file that contains a
                    match.

          -L        Print the name of each file that does not contain
                    a match.

          -n        Precede each line of output with its line number.

          -v        Print only lines that do not match pattern.

          -i        Pattern matching is case insensitive (roman let-
                    ters only).

          -s        Do not print anything; yield only the exit status.

     SOURCE
          /appl/cmd/grep.b

     SEE ALSO
          regex(2)

     DIAGNOSTICS
          Grep returns a non-nil exit status if no matches have been
          made, or if an error has occurred.