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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)uuencode.format.5 8.2 (Berkeley) 1/12/94 33.\" $FreeBSD$ 34.\" 35.Dd January 12, 1994 36.Dt UUENCODE 5 37.Os BSD 4 38.Sh NAME 39.Nm uuencode 40.Nd format of an encoded uuencode file 41.Sh DESCRIPTION 42Files output by 43.Xr uuencode 1 44consist of a header line, 45followed by a number of body lines, 46and a trailer line. 47The 48.Xr uudecode 1 49command 50will ignore any lines preceding the header or 51following the trailer. 52Lines preceding a header must not, of course, 53look like a header. 54.Pp 55The header line is distinguished by having the first 566 characters 57.Dq begin\ \& 58(note the trailing space). 59The word 60.Em begin 61is followed by a mode (in octal), 62and a string which names the remote file. 63A space separates the three items in the header line. 64.Pp 65The body consists of a number of lines, each at most 62 characters 66long (including the trailing newline). 67These consist of a character count, 68followed by encoded characters, 69followed by a newline. 70The character count is a single printing character, 71and represents an integer, the number of bytes 72the rest of the line represents. 73Such integers are always in the range from 1 to 45 or 64 and can 74be determined by subtracting the character space (octal 40) 75from the character. 76Character 64 represents a count of zero. 77.Pp 78Groups of 3 bytes are stored in 4 characters, 6 bits per character. 79All characters are always in range from 1 to 64 and are offset by a 80space (octal 40) to make the characters printing. Character 8164 represents a count of zero. 82The last line may be shorter than the normal 45 bytes. 83If the size is not a multiple of 3, this fact can be determined 84by the value of the count on the last line. 85Extra garbage will be included to make the character count a multiple 86of 4. 87The body is terminated by a line with a count of zero. 88This line consists of one 89.Tn ASCII 90backquote (octal 140) character. 91.Pp 92The trailer line consists of 93.Dq end 94on a line by itself. 95.Sh SEE ALSO 96.Xr mail 1 , 97.Xr uucp 1 , 98.Xr uudecode 1 , 99.Xr uuencode 1 100.Sh HISTORY 101The 102.Nm uuencode 103file format appeared in 104.Bx 4.0 . 105.\" It was named uuencode.5 prior to 4.3 106