1.\" Copyright (c) 1989, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)uuencode.format.5 8.2 (Berkeley) 1/12/94 29.\" $FreeBSD: src/usr.bin/uuencode/uuencode.format.5,v 1.8.2.4 2001/10/18 10:27:01 ru Exp $ 30.\" $DragonFly: src/usr.bin/uuencode/uuencode.format.5,v 1.2 2003/06/17 04:29:33 dillon Exp $ 31.\" 32.Dd January 12, 1994 33.Dt UUENCODE 5 34.Os 35.Sh NAME 36.Nm uuencode 37.Nd format of an encoded uuencode file 38.Sh DESCRIPTION 39Files output by 40.Xr uuencode 1 41consist of a header line, 42followed by a number of body lines, 43and a trailer line. 44The 45.Xr uudecode 1 46command 47will ignore any lines preceding the header or 48following the trailer. 49Lines preceding a header must not, of course, 50look like a header. 51.Pp 52The header line is distinguished by having the first 536 characters 54.Dq begin\ \& 55(note the trailing space). 56The word 57.Em begin 58is followed by a mode (in octal), 59and a string which names the remote file. 60A space separates the three items in the header line. 61.Pp 62The body consists of a number of lines, each at most 62 characters 63long (including the trailing newline). 64These consist of a character count, 65followed by encoded characters, 66followed by a newline. 67The character count is a single printing character, 68and represents an integer, the number of bytes 69the rest of the line represents. 70Such integers are always in the range from 1 to 45 or 64 and can 71be determined by subtracting the character space (octal 40) 72from the character. 73Character 64 represents a count of zero. 74.Pp 75Groups of 3 bytes are stored in 4 characters, 6 bits per character. 76All characters are always in range from 1 to 64 and are offset by a 77space (octal 40) to make the characters printing. 78Character 7964 represents a count of zero. 80The last line may be shorter than the normal 45 bytes. 81If the size is not a multiple of 3, this fact can be determined 82by the value of the count on the last line. 83Extra null characters will be included to make the character count a multiple 84of 4. 85The body is terminated by a line with a count of zero. 86This line consists of one 87.Tn ASCII 88backquote (octal 140) character. 89.Pp 90The trailer line consists of 91.Dq end 92on a line by itself. 93.Sh SEE ALSO 94.Xr mail 1 , 95.Xr uucp 1 , 96.Xr uudecode 1 , 97.Xr uuencode 1 98.Sh HISTORY 99The 100.Nm 101file format appeared in 102.Bx 4.0 . 103.\" It was named uuencode.5 prior to 4.3 104