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1 definition found
 for uuencode
From The Free On-line Dictionary of Computing (30 December 2018) :

  uuencode
  
      (Unix-to-Unix encode) A Unix program for
     encoding binary data as ASCII.  Uuencode was originally
     used with uucp to transfer binary files over serial lines
     which did not preserve the top bit of characters, but is now
     used for sending binary files by e-mail and posting to
     Usenet newsgroups etc.  The program uudecode reverses the
     effect of uuencode, recreating the original binary file
     exactly.
  
     Uuencoded data starts with a line of the form
  
     	begin  
  
     where  is the files read/write/execute permissions as
     three octal digits and  is the name to be used when
     recreating the binary data.
  
     Uuencode repeatedly takes in a group of three bytes, adding
     trailing zeros if there are less than three bytes left.  These
     24 bits are split into four groups of six which are treated as
     numbers between 0 and 63.  Decimal 32 is added to each number
     and they are output as ASCII characters from 32 (space) to
     32+63 = 95 (underscore).  Each group of sixty output
     characters (corresponding to 45 input bytes) is output as a
     separate line preceded by an 'M' (ASCII code 77 = 32+45).  At
     the end of the input, if there are N output characters left
     after the last group of sixty and N>0 then they will be
     preceded by the character whose code is 32+N.  Finally, a line
     containing just a single space is output, followed by one
     containing just "end".
  
     Sometimes each data line has an extra dummy character added to
     avoid problems which mailers that strip trailing spaces.
     These characters are ignored by uudecode.
  
     Despite using this limited range of characters, there are
     still some problems encountered when uuencoded data passes
     through certain old computers.  The worst offenders are
     computers using non-ASCII character sets such as EBCDIC.
  
     Base 64 encoding is probably now more commonly used than
     uuencode.
  
     (2004-07-17)
  

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