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uuencode(1) General Commands Manual uuencode(1)
NAME
uuencode, uudecode - encode a binary file, or decode its representation
SYNOPSIS
uuencode [-m] [ file ] name
uudecode [-o outfile] [ file ]...
DESCRIPTION
Uuencode and uudecode are used to transmit binary files over channels
that support only simple ASCII data.
Uuencode reads file (or by default the standard input) and writes an
encoded version to the standard output, using only printable ASCII
characters. The encoded output begins with a header, for use by uude-
code, which records the mode of the input file and suggests name for
the decoded file that will be created. (If name is /dev/stdout then
uudecode will decode to standard output.) The encoding has the format
documented at uuencode(5), unless the option -m is given, when base64
encoding is used instead.
Note: uuencode uses buffered input and assumes that it is not hand
typed from a tty. The consequence is that at a tty, you may need to
hit Ctl-D several times to terminate input.
Uudecode transforms uuencoded files (or standard input) into the origi-
nal form. The resulting file is named name (or outfile if the -o
option is given) and will have the mode of the original file except
that setuid and execute bits are not retained. If outfile or name is
/dev/stdout the result will be written to standard output. Uudecode
ignores any leading and trailing lines. The program determines from
the header which of the two supported encoding schemes was used.
EXAMPLES
The following example packages up a source tree, compresses it, uuen-
codes it and mails it to a user on another system. When uudecode is
run on the target system, the file ``src_tree.tar.Z'' will be created
which may then be uncompressed and extracted into the original tree.
tar cf - src_tree | compress |
uuencode src_tree.tar.Z | mail sys1!sys2!user
SEE ALSO
compress(1), mail(1), uucp(1), uuencode(5)
STANDARDS
This implementation is compliant with P1003.2b/D11.
BUGS
If more than one file is given to uudecode and the -o option is given
or more than one name in the encoded files are the same the result is
probably not what is expected.
The encoded form of the file is expanded by 37% for UU encoding and by
35% for base64 encoding (3 bytes become 4 plus control information).
REPORTING BUGS
Report bugs to <bug-gnu-utils@gnu.org>. Please put sharutils or uuen-
code in the subject line. It helps to spot the message.
HISTORY
The uuencode command appeared in BSD 4.0.
uuencode(1)
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