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.\" 30.Dd January 12, 1994 31.Dt UUENCODE 5 32.Os 33.Sh NAME 34.Nm uuencode 35.Nd format of an encoded uuencode file 36.Sh DESCRIPTION 37Files output by 38.Xr uuencode 1 39consist of a header line, 40followed by a number of body lines, 41and a trailer line. 42The 43.Xr uudecode 1 44command 45will ignore any lines preceding the header or 46following the trailer. 47Lines preceding a header must not, of course, 48look like a header. 49.Pp 50The header line is distinguished by having the first 516 characters 52.Dq begin\ \& 53(note the trailing space). 54The word 55.Em begin 56is followed by a mode (in octal), 57and a string which names the remote file. 58A space separates the three items in the header line. 59.Pp 60The body consists of a number of lines, each at most 62 characters 61long (including the trailing newline). 62These consist of a character count, 63followed by encoded characters, 64followed by a newline. 65The character count is a single printing character, 66and represents an integer, the number of bytes 67the rest of the line represents. 68Such integers are always in the range from 1 to 45 or 64 and can 69be determined by subtracting the character space (octal 40) 70from the character. 71Character 64 represents a count of zero. 72.Pp 73Groups of 3 bytes are stored in 4 characters, 6 bits per character. 74All characters are always in range from 1 to 64 and are offset by a 75space (octal 40) to make the characters printing. 76Character 7764 represents a count of zero. 78The last line may be shorter than the normal 45 bytes. 79If the size is not a multiple of 3, this fact can be determined 80by the value of the count on the last line. 81Extra null characters will be included to make the character count a multiple 82of 4. 83The body is terminated by a line with a count of zero. 84This line consists of one 85.Tn ASCII 86backquote (octal 140) character. 87.Pp 88The trailer line consists of 89.Dq end 90on a line by itself. 91.Sh SEE ALSO 92.Xr mail 1 , 93.Xr uucp 1 , 94.Xr uudecode 1 , 95.Xr uuencode 1 96.Sh HISTORY 97The 98.Nm 99file format appeared in 100.Bx 4.0 . 101.\" It was named uuencode.5 prior to 4.3 102