nftables on Linux: Basic Firewall Rules (SSH, HTTP/HTTPS) That Persist
Set up nftables on Linux: tables, chains, default drop, allow SSH and web ports, persist ruleset to /etc/nftables.conf,…
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mysqldump on Linux: Backup and Restore MySQL/MariaDB (Single Transaction)
Back up MySQL or MariaDB with mysqldump: --single-transaction for InnoDB, compress dumps, schedule with systemd timers, and test…
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systemd Timers on Linux: Schedule Jobs (Cron Alternative) With journalctl Logs
Create systemd timer units on Linux: OnCalendar schedules, linked oneshot services, list-timers, enable on boot, and migrate from…
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vmstat and iostat on Linux: CPU, Memory, Swap and Disk Bottlenecks
Read vmstat and iostat on Linux: runnable processes, iowait, swap in/out, disk utilization and await, and what to…
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awk and sed on Linux: Cut Columns, Search-Replace and Log Parsing
Use awk and sed on Linux to extract columns, filter lines, substitute text, edit files safely, and chain…
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scp and sftp on Linux: Copy Files Securely Over SSH (Upload, Download, Keys)
Copy files with scp and sftp over SSH: push and pull paths, -r directories, non-default ports, SSH keys,…
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How to Add a Swap File on Linux (Create, Enable, fstab and swappiness)
Create a swap file on Linux with fallocate or dd, mkswap, swapon, persist in /etc/fstab, tune vm.swappiness, and…
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chmod and chown on Linux: File Permissions, Octal Mode and Ownership
Understand Linux file permissions with ls -l, chmod ugo and 755/644 octal modes, recursive chmod, chown user:group, and…
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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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