If you have a ruby or node.js background, you probably came to appreciate gem and npm. Python is lacking in this respect. Current tools fail "There should be one– and preferably only one –obvious way to do it.". We show how to leverage pip and virtualenv in a non-obvious way.
I recently found a shell injection bug in some Ruby-gem I use. Shell injections have scared me for a long time and I usually prefer to whitelist certain characters/patterns rather than to blacklist. This means that the system fails to the save side. Unfortunally it usually does fail – my whitelisting is to rigorous and data that would not cause any problems gets rejected. So I decided to take the opportunity to investigate how to prevent shell injection in my favorite scripting language (Python), the language I found the problem in and finally the language that I can not avoid (PHP).
Having your private data on a laptop is dangerous, since it might be stolen. The only way to protect your data is to encrypt it. This post describes how to encrypt the home directory of your users on GNU Linux with the help of TrueCrypt and PAM. For convenience the login-password is used as encryption key.