1994-01-12 21:35:34 +03:00
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.\"
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.\" Copyright (c) 1992, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software donated to Berkeley by
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.\" Jan-Simon Pendry.
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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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" from: @(#)mount_lofs.8 8.1 (Berkeley) 6/9/93
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1994-01-12 21:38:31 +03:00
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.\" $Id: mount_lofs.8,v 1.2 1994/01/12 18:38:31 cgd Exp $
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1994-01-12 21:35:34 +03:00
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.\"
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.Dd June 9, 1993
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.Dt MOUNT_LOFS 8
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.Os BSD 4.4
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.Sh NAME
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.Nm mount_lofs
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.Nd mount a virtual copy of an existing filesystem sub-tree
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.Sh SYNOPSIS
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.Nm mount_lofs
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.Op Fl F Ar fsoptions
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.Ar target mount-point
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.Sh DESCRIPTION
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The
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.Nm mount_lofs
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command makes a sub-tree of an existing filesystem visible
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in another part of the global filesystem namespace.
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This allows existing files and directories to be accessed
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using a different pathname.
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.Pp
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The primary differences between a virtual copy of the filesystem
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and a symbolic link are that
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.Xr getcwd 3
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functions correctly in the virtual copy, and that other filesystems
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may be mounted on the virtual copy without affecting the original.
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A different device number for the virtual copy is returned by
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.Xr stat 2 ,
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but in other respects it is indistinguishable from the original.
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.Sh HISTORY
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The
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.Nm mount_lofs
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utility first appeared in 4.4BSD.
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