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ROT13(1)                   Linux Programmer's Manual                  ROT13(1)


NAME

       rot13 - shroud text with simple rot-13 cypher


SYNOPSIS

       rot13 [input [output]]


DESCRIPTION

       This manual page documents the rot13 text filter.  If no filenames are
       specified, rot13 reads from stdin and writes to stdout.  If one
       filename is specified, rot13 reads from that file and writes to stdout.
       If two filenames are specified, rot13 reads from the first file and
       writes to the second file. You may use rot13 inside the vi editor just
       as you would other filters, e.g. fmt.

       Rot13 performs Usenet-standard rot-13 encryption.  This is done by
       taking the input letter and shifting it left by 13 characters, so an A
       becomes an N, a B becomes an O, and so forth. Applying rot13 a second
       time restores the original text. The encrypted version of the sentence
       `The quick brown fox jumps over the lazy dog.' looks like this:

            Gur dhvpx oebja sbk whzcf bire gur ynml qbt.

       Note that rot-13 is obviously not secure encryption. The main purpose
       of rot13 is to shield sensitive eyes from potentially offensive or
       disturbing public messages. Most news readers provide a command to
       decode rot13 messages.  For example, the tin news reader uses the
       command 'd'.


AUTHOR

       The original author is Marc Unangst.  Various ways of contacting him
       are:
            mju@mudos.ann-arbor.mi.us
            ...!umich!leebai!mudos!mju
            Marc Unangst of 1:2200/129.0@fidonet.org

       The 1994 update was done by Thomas McWilliams. See Changelog in the
       source distribution for details.


COPYING

       Distribution permitted under the terms of the GNU General Public
       License, version 2 (or later versions at your preference). Copies of
       this agreement are available from:

            Free Software Foundation, Inc.,
            675 Mass Ave,
            Cambridge, MA 02139, USA.

Linux                            01 Sept 1994                         ROT13(1)

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