tac(1)

     NAME
          tac - concatenate and print files in reverse

     SYNOPSIS
          tac [-br] [-s separator] [--before] [--regex]
          [--separator=separator] [--help] [--version] [file...]

     DESCRIPTION
          This documentation is no longer being maintained and may be
          inaccurate or incomplete.  The Texinfo documentation is now
          the authoritative source.

          This manual page documents the GNU version of tac.  tac
          copies each given file, or the standard input if none are
          given or when a file name of `-' is encountered, to the
          standard output with the order of the records reversed.  The
          records are separated by instances of a string, or a newline
          if none is given.  By default, the separator string is
          attached to the end of the record that it follows in the
          file.

        OPTIONS
          -b, --before
               The separator is attached to the beginning of the
               record that it precedes in the file.

          -r, --regex
               The separator is a regular expression.

          -s string, --separator=string
               Use string as the record separator.

          --help
               Print a usage message and exit with a status code
               indicating success.

          --version
               Print version information on standard output then exit.