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.Dd January 12, 1994
.Dt UUENCODE 5
.Os
.Sh NAME
.Nm uuencode
.Nd format of an encoded uuencode file
.Sh DESCRIPTION
Files output by
.Xr uuencode 1
consist of a header line,
followed by a number of body lines,
and a trailer line.
The
.Xr 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
.Dq begin\ \&
(note the trailing space).
The word
.Em 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 1 to 45 or 64 and can
be determined by subtracting the character space (octal 40)
from the character.
Character 64 represents a count of zero.
.Pp
Groups of 3 bytes are stored in 4 characters, 6 bits per character.
All characters are always in range from 1 to 64 and are offset by a
space (octal 40) to make the characters printing.
Character
64 represents a count of zero.
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 null characters 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
.Tn ASCII
backquote (octal 140) character.
.Pp
The trailer line consists of
.Dq end
on a line by itself.
.Sh SEE ALSO
.Xr mail 1 ,
.Xr uucp 1 ,
.Xr uudecode 1 ,
.Xr uuencode 1
.Sh HISTORY
The
.Nm
file format appeared in
.Bx 4.0 .
.\" It was named uuencode.5 prior to 4.3