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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). E
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