176 lines
4.7 KiB
Groff
176 lines
4.7 KiB
Groff
.\" $NetBSD: uuencode.1,v 1.26 2014/09/06 21:21:36 wiz Exp $
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.\"
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.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)uuencode.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd September 6, 2014
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.Dt UUENCODE 1
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.Os
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.Sh NAME
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.Nm uuencode ,
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.Nm uudecode
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.Nd encode/decode a binary file
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.Sh SYNOPSIS
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.Nm
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.Op Fl m
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.Op Ar inputfile
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.Ar headername
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.Nm uudecode
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.Op Fl m
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.Op Fl p | Fl o Ar outputfile
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.Op Ar encoded-file ...
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.Sh DESCRIPTION
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.Nm
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and
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.Nm uudecode
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are used to transmit binary files over transmission mediums
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that do not support other than simple
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.Tn ASCII
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data.
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.Pp
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The following options are available:
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.Bl -tag -width ".Fl m"
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.It Fl m
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Use base64 encoding.
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For
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.Nm ,
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the historical uuencode algorithm is the default.
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For
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.Nm uudecode ,
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by default the encoding is automatically detected.
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.It Fl o Ar outputfile
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.Po Nm uudecode No only . Pc
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Send the decoded output data to
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.Ar outputfile .
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By default,
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.Nm uudecode
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uses the
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.Ar headername
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recorded in the header of the encoded data stream.
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.It Fl p
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.Po Nm uudecode No only . Pc
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Write the decoded file to standard output instead of to a file.
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.El
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.Pp
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.Nm
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reads
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.Ar inputfile
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(or by default the standard input) and writes an encoded version
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to (always) the standard output.
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The encoding uses only printing
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.Tn ASCII
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characters suitable for text-only transport media.
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The string
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.Ar headername
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is inserted into the output header as the
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.Ar outputfile
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to use at
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.Nm uudecode
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time.
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The header also includes the mode (permissions) of the file.
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.Pp
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.Nm uudecode
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transforms
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.Em uuencoded
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files (or by default, the standard input) into the original form.
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The resulting file is named
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.Ar headername
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as recorded in the encoded file,
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or as specified by the
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.Fl o
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option,
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and will have the mode of the original file except that setuid
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and execute bits are not retained.
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If the
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.Fl p
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option is specified, or if the output file name is given as
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.Pa /dev/stdout ,
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then the data will be written to the standard output
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instead of to a named file.
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.Nm uudecode
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ignores any leading and trailing lines.
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.Pp
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The encoded form of the file is expanded by 35%.
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Every 3 bytes become 4 plus control information.
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.Sh EXIT STATUS
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The
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.Nm uudecode
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and
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.Nm
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utilities exits 0 on success, and \*[Gt]0 if an error occurs.
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.Sh EXAMPLES
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The following example packages up a source tree, compresses it,
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uuencodes it and mails it to a user on another system.
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.Pp
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.Bd -literal -offset indent -compact
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tar czf \- src_tree \&| uuencode src_tree.tgz \&| mail user@example.com
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.Ed
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.Pp
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On the other system, if the user saves the mail to the file
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.Pa temp ,
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the following example creates the file
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.Pa src_tree.tgz
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and extracts it to make a copy of the original tree.
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.Pp
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.Bd -literal -offset indent -compact
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uudecode temp
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tar xzf src_tree.tgz
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.Ed
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.Sh SEE ALSO
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.Xr gzip 1 ,
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.Xr mail 1 ,
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.Xr tar 1 ,
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.\".Xr uucp 1 ,
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.Xr uuencode 5
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.Sh STANDARDS
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The
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.Nm uudecode
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and
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.Nm
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utilities conform to
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.St -p1003.1-2008 .
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.Sh HISTORY
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The
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.Nm uudecode
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and
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.Nm
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utilities appeared in
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.Bx 4.0 .
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.Sh SECURITY CONSIDERATIONS
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When using
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.Nm uudecode
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with files coming from dubious sources,
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always either explicitly pass the
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.Fl o
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option or check the header (the first line) of the encoded file for
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safety.
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Blindly using a
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.Ar headername
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from a hostile source can overwrite important files.
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