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\"     @(#)uuencode.1   8.1 (Berkeley) 6/6/93
\"
Dd September 6, 2014
Dt UUENCODE 1
Os
Sh NAME
Nm uuencode ,
Nm uudecode
Nd encode/decode a binary file
Sh SYNOPSIS
Nm
Op Fl m
Op Ar inputfile
Ar headername
Nm uudecode
Op Fl m
Op Fl p | Fl o Ar outputfile
Op Ar encoded-file ...
Sh DESCRIPTION
Nm
and
Nm uudecode
are used to transmit binary files over transmission mediums
that do not support other than simple
Tn ASCII
data.
Pp
The following options are available:
Bl -tag -width ".Fl m"
It Fl m
Use base64 encoding.
For
Nm ,
the historical uuencode algorithm is the default.
For
Nm uudecode ,
by default the encoding is automatically detected.
It Fl o Ar outputfile
Po Nm uudecode No only . Pc
Send the decoded output data to
Ar outputfile .
By default,
Nm uudecode
uses the
Ar headername
recorded in the header of the encoded data stream.
It Fl p
Po Nm uudecode No only . Pc
Write the decoded file to standard output instead of to a file.
El
Pp
Nm
reads
Ar inputfile
(or by default the standard input) and writes an encoded version
to (always) the standard output.
The encoding uses only printing
Tn ASCII
characters suitable for text-only transport media.
The string
Ar headername
is inserted into the output header as the
Ar outputfile
to use at
Nm uudecode
time.
The header also includes the mode (permissions) of the file.
Pp
Nm uudecode
transforms
Em uuencoded
files (or by default, the standard input) into the original form.
The resulting file is named
Ar headername
as recorded in the encoded file,
or as specified by the
Fl o
option,
and will have the mode of the original file except that setuid
and execute bits are not retained.
If the
Fl p
option is specified, or if the output file name is given as
Pa /dev/stdout ,
then the data will be written to the standard output
instead of to a named file.
Nm uudecode
ignores any leading and trailing lines.
Pp
The encoded form of the file is expanded by 35%.
Every 3 bytes become 4 plus control information.
Sh EXIT STATUS
The
Nm uudecode
and
Nm
utilities exits 0 on success, and >0 if an error occurs.
Sh EXAMPLES
The following example packages up a source tree, compresses it,
uuencodes it and mails it to a user on another system.
Pp
Bd -literal -offset indent -compact
tar czf \- src_tree \&| uuencode src_tree.tgz \&| mail [email protected]
Ed
Pp
On the other system, if the user saves the mail to the file
Pa temp ,
the following example creates the file
Pa src_tree.tgz
and extracts it to make a copy of the original tree.
Pp
Bd -literal -offset indent -compact
uudecode temp
tar xzf src_tree.tgz
Ed
Sh SEE ALSO
Xr gzip 1 ,
Xr mail 1 ,
Xr tar 1 ,
\".Xr uucp 1 ,
Xr uuencode 5
Sh STANDARDS
The
Nm uudecode
and
Nm
utilities conform to
St -p1003.1-2008 .
Sh HISTORY
The
Nm uudecode
and
Nm
utilities appeared in
Bx 4.0 .
Sh SECURITY CONSIDERATIONS
When using
Nm uudecode
with files coming from dubious sources,
always either explicitly pass the
Fl o
option or check the header (the first line) of the encoded file for
safety.
Blindly using a
Ar headername
from a hostile source can overwrite important files.

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