Category: Software

Installing mcrypt (PHP) on AWS Linux AMI

Update: with the update of PHP to v5.3.3, the amzn repository now includes php-mcrypt, rendering the steps below unnecessary. At the moment, the amzn repository has v5.3.2 of PHP (while the latest version is v5.3.3) – it also does not offer php-mcrypt. While in previous servers I have included a wider selection of repositories, I… Continue reading Installing mcrypt (PHP) on AWS Linux AMI

Installing APC on AWS Linux AMI

Update: Current versions of Amazon’s Linux AMI include the package php-pecl-apc (v3.1.9 – the same as the latest from PECL) in the repository. Using a package manager is usually preferable to using PECL- it will help you keep up to date, is centrally managed, and minimizes unnecessary dependencies (especially build tools). APC can be installed… Continue reading Installing APC on AWS Linux AMI

Coding with DNA

Alright, this one isn’t quite as exciting as the title suggests. I had the need of a quick script for a bit of biology – genetics. Pretty simple stuff really, but I thought I would post it anyway. Generating random sequences of DNA function randdna($len){ $length=intval($len); $bases=array(‘A’,’C’,’G’,’T’); $dna=””; for ($i=0; $i<$length;$i++){ $dna .=$bases[mt_rand(0,3)]; } return… Continue reading Coding with DNA

Full Text Searching

For one reason or the other, I have often had a need to find matches in large data sets, usually containing significant quantities of text. One example was a 100k chapters of stories (totaling about 1.5Gb, unformatted) that I wanted to be able to search. While this is quite small when compared to even the… Continue reading Full Text Searching

Change Permissions of Specific File Types

To change the file permissions for all PHP files to 754: find . -type f -name ‘*.php’ -exec chmod 754 {} \; To find all files with permissions 754: find . -perm -754 To find all files that are not writable by the owner: find . ! -perm -u+w

Fix Line Breaks

To convert all files: $ find . -type f -name -exec dos2unix {} \; To convert specific files (by type): $ find . -type f \( -name “*.php” -o -name “*.txt” -o -name “*.css” \) -exec dos2unix {} \;

Balancing Chemical Equations Using Matrices

There are some days when technology just doesn’t agree with one, so today’s post is more scientific in nature. There are many instances when chemical equations need to be balanced, and perhaps mentioning them outside of school is geeky enough, but this isn’t going to be a science lesson. Most of us learned how to… Continue reading Balancing Chemical Equations Using Matrices