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.\"-
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.\" Copyright (c) 2000, 2001 Robert N. M. Watson
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd March 30, 2000
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.Dt GETEXTATTR 8
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.Os
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.Sh NAME
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.Nm getextattr
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.Nd retrieve a named extended attribute
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.Sh SYNOPSIS
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.Nm
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.Op Fl ls
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.Ar attrnamespace
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.Ar attrname
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.Ar filename ...
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.Sh DESCRIPTION
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.Nm
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is a user tool to retrieve a named extended attribute on a file or
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directory.
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The
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.Ar attrnamespace
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argument should be the namespace of the attribute to retrieve: legal
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values are "user" and "system".
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The
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.Ar attrname
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argument should be the name of the attribute, and
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.Ar filename
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a list of files and directories from which to retrieve attribute data.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl l
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Print attributes in the first column and file names in the second.
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Can be used only in conjunction with the
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.Fl s
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option.
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.It Fl s
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Attempt to display the attribute data as a string, although the
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results may not look pretty if the data is binary data.
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The
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.Xr strvisx 3
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function is used to generate the string, so control sequences should
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be safely escaped.
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Otherwise, the attribute data will be represented as a series of two-digit
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hex numbers.
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.El
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.Sh IMPLEMENTATION NOTES
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In order for
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.Nm
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to succeed, the attribute service must be available on the file system,
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and the attribute must of defined for the file queried.
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.Sh EXAMPLES
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.Bd -literal -offset indent
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# getextattr system md5 /kernel
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/kernel:
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61 61 33 62 39 39 66 65 31 35 35 32 31 62 65 32
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62 36 38 36 62 31 66 39 63 64 33 39 35 36 36 31
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# getextattr -s md5 /kernel
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/kernel: "aa3b99fe15521be2b686b1f9cd395661"
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.Ed
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.Pp
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Retrieve the
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.Dq md5
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extended attribute for the file
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.Pa /kernel .
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.Sh SEE ALSO
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.Xr extattrctl 8 ,
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.Xr setextattr 8 ,
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.Xr extattr 9
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.Sh HISTORY
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Extended attribute support was developed as part of the TrustedBSD Project,
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and introduced in
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.Fx 5.0 .
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It was developed to support security extensions requiring additional labels
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to be associated with each file or directory.
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.Sh AUTHORS
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Robert N M Watson
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.Sh BUGS
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Only the first 2048 bytes of the extended attribute value are displayed
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due to a hard-coded buffer limit.
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