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ROT13.TXT
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1997-01-03
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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 con-
tacting 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 pref-
erence). Copies of this agreement are available from:
Free Software Foundation, Inc.,
675 Mass Ave,
Cambridge, MA 02139, USA.
Linux 01 Sept 1994 1