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The mythical “idempotent” file editing

Stop asking for that.

Some common networking operations in Perl

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

“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.