UUENCODE(4)							   UUENCODE(4)

NAME    [Toc]    [Back]

     uuencode -	format of an encoded uuencode file

DESCRIPTION    [Toc]    [Back]

     Files output by uuencode(1C) consist of a header line, followed by	a
     number of body lines, and a trailer line.	Uudecode(1C) 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 ".	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 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.

     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.

     The trailer line consists of "end"	on a line by itself.

SEE ALSO    [Toc]    [Back]

     uuencode(1C), uudecode(1C), uucp(1C), mail(1)


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