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A framework for BackupPC‘s pre/post scripts

Use the same framework for all hosts, and run per-host scripts where needed.

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Detecting empty files in awk

It's not straightforward, but it can be done.

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(Semi-)Automated ~/.ssh/config management

Shorten your ssh commands, but in a kludgy way.

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Remote-to-remote data copy

Ever wanted to do this?

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The mythical “idempotent” file editing

Stop asking for that.

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Some common networking operations in Perl

A collection of various network- and socket API-related functions with code snippets.

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“On the fly” IPsec VPN with iproute2

Only for emergencies.

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“Range of fields” in awk

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

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Three text processing tasks

Unlikely to help someone, but anyway.

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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 […]

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A simple SameGame implementation

Doing something interesting to practice.

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Port mirroring with Linux bridges

Port mirroring with the most popular Linux bridge implementations.

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Poor man’s directory tree replication

Bulk replication of directory trees.