Help with refining script Post: 302988748

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Top Forums Shell Programming and Scripting Help with refining script Post 302988748 by stomp on Monday 2nd of January 2017 12:01:27 AM

01-02-2017

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Off-Topic

Quote:

Originally Posted by bakunin

In a 1000-lines script it can make the difference between a change taking 5 minutes, five hours or even five days. How a script of mine looks like can be seen here. I still use the same header whenever i start a new script.

I agree to learning a good programming style is helpful in many ways. I may add that choice of the programming language is one of the questions of good programming style too. I myself decided that at projects of a certain size, bash or shell scripting in general is a pain in the ass, due to the lack of efficient programming possibilites(clean function calls only as subprocess and ineffiency in general), an annoying quoting mess and a the default that all variables are global(yes, there's local too, I know). You need a very good discipline to write larger shell scripts, or you're sooner than later in a bloody mess.

I wrote some some larger shell scripts - with the experience of certainly some 100K lines Shell-Scripting or more - because it was easier to start with, even thinking it through with my goal in mind and believing that it might work with Bash. But at a certain point it's ineffiency compared to any scripting languages made me regret the decicision to use a Shell Script.

And yes - every case needs it's review. That's not a general expression of "Shell is improper for any larger program".

The charm is of course it's platform indepency. Nothing to install. A Shell/Bash is everywhere available. Of course a truly platform independent script must include extensive Checking of the environment for all program calls and it's options besides those provided by the basic set and strictly sticking to standard conform methods and feature sets. But still no real satisfaction to write such a monster like INXI, which I consider as good tool for the job it is designed to do(Even the author of INXI wrote in its README on github, that he does not like it, but that it is the best choice for his goals).

Last edited by stomp; 01-02-2017 at 01:17 AM..

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net::ldap::control::postread

Net::LDAP::Control::PostRead(3) 			User Contributed Perl Documentation			   Net::LDAP::Control::PostRead(3)

NAME

       Net::LDAP::Control::PostRead - LDAPv3 Post-Read control object

SYNOPSIS

	use Net::LDAP;
	use Net::LDAP::Control::PostRead;
	use Net::LDAP::Constant qw( LDAP_CONTROL_POSTREAD LDAP_SUCCESS );

	$ldap = Net::LDAP->new( "ldap.mydomain.eg" );

	$postread = Net::LDAP::Control::PostRead->new( attrs => [ qw/givenName/ ] );

	my $mesg = $ldap->modify( "cn=Barbara Jensen, o=University of Michigan, c=US",
				  replace => { givenName => "Babs" },
				  control => $postread );

	if ($mesg->code eq LDAP_SUCCESS) {
	  my ($afterwards) = $mesg->control( LDAP_CONTROL_PREREAD );
	  my $entry = $afterwards ? $afterwards->entry() : undef;

	  if ($entry) {
	    print "givenName changed to '" .
		  join("', '", $entry->get_value(givenName") .
		  "' to 'Babs'
");
	  }
	}

DESCRIPTION

       "Net::LDAP::Control::PostRead" provides an interface for the creation and manipulation of objects that represent the "Post-Read Controls"
       as described by RFC 4527.

       In modification operations, the "Post-Read request control" indicates to the server that a copy of the modified entry after the update is
       to be returned.	After the successful completion of the operation, the accompanying "Post-Read response control" allows one to retrieve the
       updated value from the servers's response.

       One use case of this control may be to obtain values of operational attributes, such as the "entryUUID" and "modifyTimestamp" attributes,
       updated by the server as part of the update operation.

CONSTRUCTOR ARGUMENTS

       In addition to the constructor arguments described in Net::LDAP::Control the following are provided.

       attrs => [ ATTR, ... ]
	   A list of attributes to be returned in the entry returned in the response control.

	   If absent, all attributes are returned.

	   Operational attributes may be included in the list by explicitly asking for them or by using special "+" feature (provided the server
	   supports this feature).

METHODS

       As with Net::LDAP::Control each constructor argument described above is also available as a method on the object which will return the
       current value for the attribute if called without an argument, and set a new value for the attribute if called with an argument.

       In addition to these methods, the control also supports the following method:

       entry ()
	   Returns the entry from the response control in the response message to the LDAP request that contained the request control.

	   The result is either a Net::LDAP::Entry object or undefined.

SEE ALSO

       Net::LDAP, Net::LDAP::Control, http://www.ietf.org/rfc/rfc4527.txt

AUTHOR

       Peter Marschall <peter@adpm.de>

       Please report any bugs, or post any suggestions, to the perl-ldap mailing list <perl-ldap@perl.org>

COPYRIGHT

       Copyright (c) 2008,2011 Peter Marschall. All rights reserved. This program is free software; you can redistribute it and/or modify it under
       the same terms as Perl itself.

perl v5.16.3							    2013-06-07					   Net::LDAP::Control::PostRead(3)