Bash

Find where cron logs live on your Linux system and learn how to read them to confirm scheduled jobs actually ran.

A DNS amplification attack floods a victim with forged responses by exploiting open resolvers. This post walks through iptables rules and BIND hardening steps to block the attack vector.

A quick one-liner to flush every message out of the Exim mail queue. Useful when a misconfigured relay or a flood of bounce messages has clogged up your server.

Learn how to manually decompress an RPM package into a working directory using rpm2cpio and cpio, without installing the package.

A quick awk one-liner that pulls RPM package URLs from log files or package lists by matching lines containing both ‘autoinstall’ and ‘.rpm’.

A quick bash script to identify and repair MySQL tables with invalid or corrupted MYI key files, then force a rebuild using USE_FRM.