Monthly Archives: September 2011

Timing the Execution Time of a Script

Posted on September 29, 2011 by danmassey99

If you want to test the time it takes to run a script, you can use the UNIX ‘time’ command. the manual page states: The time utility executes and times the specified utility. After the utility finishes, time writes to … Continue reading →

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Final Virtusertable Perl Sort

Posted on September 29, 2011 by danmassey99

As the final stage of the sorting posts, I’ve converted the original virtusertable sort to the ‘Schwartzian Transform’ with multiple sorts. Notice i create the ‘sub arrays’ with 3 items: $_[0] = “user@domain <whitespace> target” $_[1] = “domain” $_[2] = … Continue reading →

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Perl Sorting with a bit more efficiency

Posted on September 29, 2011 by danmassey99

I’ve modified the script from the last post to illustrate how many times the get_value function is called. #! /usr/bin/perl -w use strict; my %letter_vals; my $counter = 1; my $function_calls = 0; # function to calculate the ‘value’ of … Continue reading →

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More Perl sorting

Posted on September 28, 2011 by danmassey99

After my last post about perl sorting, a friend of mine, who is an ardent hater of Perl (amongst a long list of other things), pointed out that his shell script was not only shorter, but also faster at sorting … Continue reading →

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Using Active Directory to Authenticate VPN Users on Cisco ASA

Posted on September 27, 2011 by danmassey99

We have a client who has circa 200 users with a significant number of roaming users. The roaming users access to the network is via a remote access VPN. Initially the users credentials were added to the Cisco ASA like … Continue reading →

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References 2, Scratching at Complex Data Structures

Posted on September 27, 2011 by danmassey99

Back again for another bite of the Alpaca? In order to take our references to the next level we need to start making arrays of arrays and arrays of hashes and other such complex arrangements. I’ll be starting of with … Continue reading →

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Perl References – In the beginning

Posted on September 26, 2011 by danmassey99

I spend a few minutes here and there reading the ‘Alpaca’ book (Intermediate Perl) and feel its time to get a grip of references. It seems that a reference is only like a pointer in C so given that Perl … Continue reading →

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Tricks with .tgz files (includes listing the contents)

Posted on September 26, 2011 by danmassey99

Ever wanted to know whats in a  .tgz file before opening it up and  expanding? tar -ztvf <archive_name.tgz> Once you have a list of whats in the archive, how about just extracting a single file from the archive? # list … Continue reading →

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Sorting a list of email addresses with Perl (virtusertable)

Posted on September 25, 2011 by danmassey99

I’ve always had a mental block when sorting with Perl, but I was asked to write a quick script to sort out the /etc/mail/virtusertable file for our sendmail setup. The format of the table is as follows: <email address> (whitespace) … Continue reading →

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Quick MySQL Server setup notes

Posted on September 5, 2011 by danmassey99

Here are my quick and dirty setup notes for MySQL server cd /usr/ports/databases/mysql51-server make install ee /etc/rc.conf add –/– mysql_enable=”YES” mysql_dbdir=”/data/mysql” –/– /usr/local/etc/rc.d/mysql-server start Now we need to add a password to secure it and another password for remote admin: … Continue reading →

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