uuencode - format of an encoded uuencode file
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.
The header line is distinguished by having the first 6 characters
``begin '' (note the trailing space). The word 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.
The body consists of a number of lines, each at most 62
(including the trailing newline). These consist of a character count,
followed by encoded characters, followed by a newline. The
count is a single printing character, and represents an integer, the number
of bytes the rest of the line represents. Such integers
in the range from 0 to 63 and can be determined by subtracting the character
space (octal 40) from the character.
Groups of 3 bytes are stored in 4 characters, 6 bits per
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
Extra garbage will be included to make the character count a
4. The body is terminated by a line with a count of zero.
consists of one ASCII ` (opening single quote) character.
The trailer line consists of ``end'' on a line by itself.
mail(1), uudecode(1), uuencode(1)
The uuencode file format appeared in 4.0BSD.
OpenBSD 3.6 January 12, 1994
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