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'.\" Copyright (c) 1989, 1991 The Regents of the University of California.
'.\" All rights reserved.
'.\"
'.\" Redistribution and use in source and binary forms, with or without
'.\" modification, are permitted provided that the following conditions
'.\" are met:
'.\" 1. Redistributions of source code must retain the above copyright
'.\" notice, this list of conditions and the following disclaimer.
'.\" 2. Redistributions in binary form must reproduce the above copyright
'.\" notice, this list of conditions and the following disclaimer in the
'.\" documentation and/or other materials provided with the distribution.
'.\" 3. All advertising materials mentioning features or use of this software
'.\" must display the following acknowledgement:
'.\" This product includes software developed by the University of
'.\" California, Berkeley and its contributors.
'.\" 4. Neither the name of the University nor the names of its contributors
'.\" may be used to endorse or promote products derived from this software
'.\" without specific prior written permission.
'.\"
'.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
'.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
'.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
'.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
'.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
'.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
'.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
'.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
'.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
'.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
'.\" SUCH DAMAGE.
'.\"
'.\" @(#)uuencode.format.5 6.4 (Berkeley) 5/10/91
'.\"
.TH UUENCODE 5
.SH NAME
uuencode \- format of an encoded uuencode file
.SH DESCRIPTION
Files output by
uuencode(1)
consist of a header line,
followed by a number of body lines,
and a trailer line.
The
uudecode(1)
command
will ignore any lines preceding the header or
following the trailer.
Lines preceding a header must not, of course,
look like a header.
.PP
The header line is distinguished by having the first
6 characters
.I begin\ \&
The word
.I begin
is followed by a mode (in octal),
and a string which names the remote file.
A space separates the three items in the header line.
.PP
The body consists of a number of lines, each at most 62 characters
long (including the trailing newline).
These consist of a character count,
followed by encoded characters,
followed by a newline.
The character count is a single printing character,
and represents an integer, the number of bytes
the rest of the line represents.
Such integers are always in the range from 0 to 63 and can
be determined by subtracting the character space (octal 40)
from the character.
.PP
Groups of 3 bytes are stored in 4 characters, 6 bits per character.
All are offset by a space to make the characters printing.
The last line may be shorter than the normal 45 bytes.
If the size is not a multiple of 3, this fact can be determined
by the value of the count on the last line.
Extra garbage will be included to make the character count a multiple
of 4.
The body is terminated by a line with a count of zero.
This line consists of one ASCII space.
.PP
The trailer line consists of
.I end
on a line by itself.
.SH SEE ALSO
uuencode(1), uudecode(1), uusend(1), uucp(1), mail(1)
.SH HISTORY
The
.I uuencode
file format appeared in BSD 4.0 .
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