nftables Firewall Basics on Linux (Replace iptables)
Configure nftables firewall on Rocky Linux, AlmaLinux, and Fedora. Allow SSH and web ports with a simple ruleset.
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Linux Port Monitor Shell Script (Check Open Ports & Services)
Monitor open ports and running services on Linux with a Bash script. Alert when expected ports are closed.
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iptables Firewall Backup & Restore Shell Script for Linux
Backup and restore iptables firewall rules on Linux with a Bash script. Save rules before updates or reboots.
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Failed SSH Login Report Shell Script (Brute Force Detection)
Detect failed SSH login attempts on Linux with a Bash script. Report top attacking IPs from auth logs.
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UFW Firewall Basics: Secure Your Linux Server
Configure UFW firewall on Ubuntu and Debian. Allow SSH, HTTP, HTTPS and block unwanted traffic.
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Linux File Permissions Explained: chmod, chown, and umask
Learn linux file permissions with step-by-step Linux commands, examples, and admin tips for beginner-level users.
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