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BSD 2.11 - man page for uuencode (bsd section 5)

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UUENCODE(5)									      UUENCODE(5)

       uuencode - format of an encoded uuencode file

       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.

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

7th Edition				   May 15, 1985 			      UUENCODE(5)
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