tail head cat sleep
QR code linking to this page

Manual Pages  — UUENCODE

NAME

uuencode – format of an encoded uuencode file

CONTENTS

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, 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 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 BSD 4.0 .

UUENCODE (5) January 12, 1994

tail head cat sleep
QR code linking to this page


Please direct any comments about this manual page service to Ben Bullock.

Ken Thompson was once asked by a reporter what he would have changed about Unix if he had it all to do over again. His answer: “I would spell creat with an ‘e.'”