A Java application on one of my servers has been causing problems by opening up too many network connections and not closing them quickly...

In this scenario, a user emailed some other user something that probably should not have been emailed. You don't know who the users are...

Here's a quick example of using tshark to extract email addresses from TCP streams. Let's say some application on your server is sending emails and...

At the risk of repeating myself, I must say that this article is about obfuscating passwords - rendering obscure, unclear, or unintelligible - not hiding...

Long story short: old wiki is overloaded and broken; new wiki is not a wiki but SharePoint - a glorified file server; people are...

The croncal is a clever Perl script that reads entries in your crontab and outputs a schedule, showing the time when cron jobs will run. This can...

While I am on the subject of selecting time ranges from logs, a practical application presented itself. A lonely server in a far-away land...

Sometimes you need dummy folder structures populated with random data for testing your various scripts and processes - backups, file transfers, encryption, compression, etc....

Etckeeper is a handy tool that uses git to keep track of changes to anything in /etc (or any other folder you choose). It's very simple...