We have a Perl CGI script at work that acts as a proxy. It grabs a pkcs12 digital certificate file from an internal server and delivers it to a user through his or her web browser. The pkcs12 file is in binary format. Everything worked fine until we put the code on a new server. Suddenly, the files downloaded by the...

Here are some random Perl things I always need to look up: Print the string representation in hex print join( ’ ', map { unpack “H*”, $_ } split( //, $x ) ); Text replacement on a per-file basis perl -pi -e 's/\/business\//\/illus\/business.html/' */*.html -p : Iterate over each line of the file -i : Don’t create a...

Hand history files, like computer programs, are notoriously difficult to read. Software developers use syntax coloring to highlight keywords and contrast different sections of code. I've developed a syntax definition file for the Vim editor that colors both Poker Stars and Full Tilt Poker hand history files....

Recently, I was asked by my employer to write an Apache module. The module reads the requestor’s digital certificate and checks it against our database of active users. In this post, I’ll explain how to get started writing Apache modules, especially for Red Hat Enterprise Linux 5 (RHEL 5.2). The best (and possibly...

Splitting a Perl application into seperate files can be trickier than doing it in other languages, like C or C++, but it is still an important part of producing maintainable code. Creating the Package A Perl module is a collection of code stored in a single file. By definition, all variables and function names in...

This is an H2 Heading From Moby Dipsum… Call me Ishmael. Some years ago—never mind how long precisely—having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world. It is a way I have of driving off the spleen and...