find Command on Linux: Search by Name, Size, Age and Run Actions
Find files on Linux with find: -name globs, -type, -mtime and -size, -maxdepth, -prune to skip paths, and…
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grep Command on Linux: Search Files, Logs and Pipelines (with Regex Basics)
Use grep on Linux to search files and command output: -i, -r, -n, context lines, extended regex, include/exclude…
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tar, gzip and zip on Linux: Create, List and Extract Archives Safely
Create .tar.gz archives on Linux, list contents before extracting, use zip and unzip, exclude junk files, preserve permissions…
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ss Command on Linux: Listening Ports, Connections and Troubleshooting
Use ss on Linux instead of netstat: list listening TCP/UDP ports, show established connections, map sockets to PIDs,…
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How to Kill a Process on Linux: SIGTERM, SIGKILL, pkill and systemd
Stop runaway Linux processes safely: find the PID, send SIGTERM vs SIGKILL, use pkill and killall, understand zombies,…
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curl and wget on Linux: Download Files, Headers, APIs and Scripts
Use curl and wget on Linux to download files, inspect HTTP headers, POST JSON to APIs, resume downloads…
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htop and top on Linux: CPU, Memory, Load Average and Swap Explained
Use free, top and htop on Linux to read CPU usage, memory, load average and swap; sort processes,…
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Centralise Linux Logs with systemd-journal-remote (Forward and Collect)
Forward systemd journal logs to a central collector with systemd-journal-upload and systemd-journal-remote, secure with HTTPS, and search with…
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Fail2ban Nginx Jail: Block Abusive IPs (HTTP 404/401 floods and scanners)
Configure Fail2ban jails for Nginx: install filters for 404/401 abuse and bad bots, set findtime and bantime, test…
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Install and Secure Redis on Linux (bind, AUTH, firewall, TLS basics)
Install Redis on Linux, bind to localhost or a private interface, set requirepass and ACLs, firewall port 6379,…
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