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Full Discussion: Lofs
Top Forums UNIX for Advanced & Expert Users Lofs Post 302099926 by Perderabo on Thursday 14th of December 2006 06:45:46 PM
Old 12-14-2006
The Solaris style of loopback filesystem is an alternative to symbolic links. Let's assume that you have / and /usr filesystems and they are somewhat full but you want to create a /usr/local hierarchy. And let's assume that you have a /export filesystem with plenty of space. You could create a directory called, say, /export/usr.local then create a symbolic link called /usr/local that points to it. Symbolic links have various problems though. As one example:
cd /usr/local/
cd ..
might place you in /export or it might place you in /usr. Some shells like ksh have a "cd -L" and a "cd -P" so they can do either. Other shells might do one or the other. But now instead of a symlink, we can make a directory called /usr/local and do a loopback mount of /export/usr.local on it. Now, /usr/local has only one parent directory, which is /usr. That is pretty much it. It removes the screwy side effects of symlinks.
 

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plxload

PLXLOAD(1p)						User Contributed Perl Documentation					       PLXLOAD(1p)

NAME

       plxload - show what files a perl program loads at compile time

SYNOPSYS

	   $ plxload

DESCRIPTION

       This program is used to show what modules a program would load at compile time via "use".  Because this installs an at-exit handler and
       then uses Perl's -c flag for compile only, it will not find modules loaded at run-time.	Use the Devel::Loaded module for that.

EXAMPLES

	   $ plxload perldoc
	   /usr/local/devperl/lib/5.00554/Exporter.pm
	   /usr/local/devperl/lib/5.00554/strict.pm
	   /usr/local/devperl/lib/5.00554/vars.pm
	   /usr/local/devperl/lib/5.00554/i686-linux/Config.pm
	   /usr/local/devperl/lib/5.00554/Getopt/Std.pm

	   $ plxload /usr/src/perl5.005_54/installhtml
	   /usr/local/devperl/lib/5.00554/Carp.pm
	   /usr/local/devperl/lib/5.00554/Exporter.pm
	   /usr/local/devperl/lib/5.00554/auto/Getopt/Long/autosplit.ix
	   /usr/local/devperl/lib/5.00554/strict.pm
	   /usr/local/devperl/lib/5.00554/vars.pm
	   /usr/local/devperl/lib/5.00554/Pod/Functions.pm
	   /usr/local/devperl/lib/5.00554/Getopt/Long.pm
	   /usr/local/devperl/lib/5.00554/i686-linux/Config.pm
	   /usr/local/devperl/lib/5.00554/lib.pm
	   /home/tchrist/perllib/Pod/Html.pm
	   /usr/local/devperl/lib/5.00554/Cwd.pm
	   /usr/local/devperl/lib/5.00554/AutoLoader.pm

SEE ALSO

       Devel::Loaded and pmload(1).

AUTHORS and COPYRIGHTS
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       Copyright (C) 2006-2008 Mark Leighton Fisher.

       This is free software; you can redistribute it and/or modify it under the terms of either: (a) the GNU General Public License as published
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       Please note this is a change from the original pmtools-1.00 (still available on CPAN), as pmtools-1.00 were licensed only under the Perl
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