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Operating Systems AIX [Tip] FS-Manipulation in 7.1.3-Clusters Post 302952350 by bakunin on Tuesday 18th of August 2015 06:44:40 AM
Old 08-18-2015
Quote:
Originally Posted by agent.kgb
bakunin is right. The command imfs is not documented. The redbook is the only documentation about a lot of intermediate-level LVM commands and it is very outdated. There are some other undocumented and very useful commands in the redbook, such as ipl_varyon, getlvodm or lvlstmajor. IBM doesn't like if you know too much about AIX internals ;-)
This is absolutely true!

It might be a worthwile community project to write documentation for these undocumented commands. getlvodm, for instance, i have used literally for decades now (it must have been introduced in AIX 4.1.x or so). Anybody interested?

bakunin

@Scrutinizer: i took agent.kgbs link as a rather witty comeback regarding my use of the word "undocumented". No harm done. ;-))
 

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AutoLoader(3)						User Contributed Perl Documentation					     AutoLoader(3)

NAME
PDL::AutoLoader - MatLab style AutoLoader for PDL SYNOPSIS
use PDL::AutoLoader; $a = func1(...); # Load file func1.pdl $b = func2(...); # Load file func2.pdl $PDL::AutoLoader::Rescan = 1; # Enable re-scanning DESCRIPTION
This module implements a MatLab style AutoLoader for PDL. If a unknown function 'func()' is called then a file 'func.pdl' is searched for and if found is read in to define 'func()' which is then executed. Files are seached for using the directories in seach path @PDLLIB, which is initialised from the shell environment variable "PDLLIB" which is a colon seperated list of directories. e.g. in csh setenv PDLLIB "/home/kgb/pdllib:/local/pdllib" Note this is kept seperate from "PERL5LIB" just in case. As an added bonus, you can use a leading '+' on a directory name to search not just that directory but the entire directory tree under it (excluding symlinks). The subdirs are determined by explicit search, and searches occur at startup and again each time you change the num- ber of elements in @PDLLIB. For example, setenv PDLLIB "+~kgb/PDL" will search /home/kgb/PDL and all its subdirectories for .pdl files. AUTO-SCANNING The variable $PDL::AutoLoader::Rescan controls whether files are automatically re-scanned for changes at the "perldl" command line. If "$PDL::AutoLoader::Rescan == 1" and the file is changed then the new definition is reloaded auto-matically before executing the "perldl" command line. Which means in practice you can edit files, save changes and have "perldl" see the changes automatically. The default is '0' - i.e. to have this feature disabled. As this feature is only pertinent to the "perldl" shell it imposes no overhead on PDL scripts. Yes Bob you can have your cake and eat it too! Note: files are only re-evaled if they are determined to have been changed according to their date/time stamp. No doubt this interface could be improved upon some more. :-) Sample file: sub foo { # file 'foo.pdl' - define the 'foo' function my $x=shift; return sqrt($x**2 + $x**3 + 2); } 1; # File returns true (i.e. loaded successfully) AUTHOR
Copyright(C) 1997 Karl Glazebrook (kgb@aaoepp.aao.gov.au); several extensions by Craig DeForest (deforest@boulder.swri.edu) All rights reserved. There is no warranty. You are allowed to redistribute this software / documentation under certain conditions. For details, see the file COPYING in the PDL distribution. If this file is separated from the PDL distribution, the copyright notice should be included in the file. BUGS
No doubt this interface could be improved upon some more. :-) Will probably be quite slow if "$PDL::AutoLoader::Rescan == 1" and thousands of functions have been autoloaded. There could be a race condition in which the file changes while the internal autoloader code is being executed but it should be harmless. Probably has not been tested enough! perl v5.8.0 2002-08-06 AutoLoader(3)
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