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“On the fly” IPsec VPN with iproute2

Only for emergencies.

“Range of fields” in awk

This is asked very often, and the solution isn't always obvious (if at all).

Three text processing tasks

Unlikely to help someone, but anyway.

File encryption on the command line

This list is just a reference which hopefully saves some googling. Let's make it clear that we're talking about symmetric encryption here, that is, a password (or better, a passphrase) is supplied when the file is encrypted, and the same password can be used to decrypt it. No public/private key stuff or other preparation should […]

A simple SameGame implementation

Doing something interesting to practice.