Bash

Learn how to insert iptables rules at a specific position using the -I flag, with syntax breakdown and a practical SSH example.

Configure the soft and hard stack limits for the Apache user in /etc/security/limits.conf to prevent segmentation faults caused by insufficient stack space.

A practical guide to tuning Linux TCP/IP kernel parameters for high-speed, high-latency broadband connections, covering buffer sizing, timeout adjustments, SYN flood protection, and congestion control selection.

Filter Apache access logs by IP address and date using awk. A quick, practical approach to pulling specific entries without loading a full log viewer.

A quick awk pipeline to pull wp-login.php access attempts from web server logs and flag IPs that exceed a threshold. Useful for spotting brute-force or scanning activity against WordPress sites.

A lightweight bash script that automatically allocates and assigns an Elastic IP to an EC2 instance at launch using User Data, eliminating the need for manual IP management.