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@(#)uuencode.format.5 8.2 (Berkeley) 1/12/94
$FreeBSD: head/usr.bin/uuencode/uuencode.format.5 84715 2001-10-09 11:05:27Z ru $
.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.
p 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.
p 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.
p 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.
p
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
x 4.0 . It was named uuencode.5 prior to 4.3