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FreeBSD 11.0 - man page for uuencode (freebsd section 5)

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UUENCODE(5)			     BSD File Formats Manual			      UUENCODE(5)

NAME
     uuencode -- format of an encoded uuencode file

DESCRIPTION
     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 characters long (including the
     trailing newline).  These consist of a character count, followed by encoded characters, fol-
     lowed 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.

     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 ASCII backquote (octal 140) character.

     The trailer line consists of ``end'' on a line by itself.

SEE ALSO
     mail(1), uucp(1), uudecode(1), uuencode(1)

HISTORY
     The uuencode file format appeared in 4.0BSD.

BSD					 January 12, 1994				      BSD
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