mv Command in Linux: Move and Rename Files (Examples)
Move and rename files with mv: overwrite protection, backups, moving across filesystems, bulk renaming with loops and rename, and common mistakes.
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Linux
Linux server administration: Debian, Ubuntu, AlmaLinux, storage, performance and troubleshooting.
rsyslog Configuration: Log Files, Filters and Remote Logging
Configure rsyslog: where logs go, facilities and severities, a log file per program, forwarding to a central server over TCP, and rsyslog vs journald.
How to Troubleshoot Any Linux Server Problem: A Methodology
A method for Linux troubleshooting: define the problem, check what changed, the USE method for resources, logs first, isolate layers, one change at a time.
Linux Mount Options: noatime, relatime, noexec, nofail and More
Useful Linux mount options: noatime vs relatime, noexec, nosuid and nodev for security, nofail for extra disks, _netdev, remounting, and safe fstab edits.
ssh-keygen: Create SSH Keys and Log In Without Passwords
Generate Ed25519 SSH keys with ssh-keygen, copy them to a server with ssh-copy-id, use ssh-agent, manage multiple keys and disable password logins safely.
ls Command in Linux: List Files with Useful Options
List files with ls: long format, hidden files, human-readable sizes, sorting by time or size, recursive listings, reading permissions and handy aliases.
wc Command in Linux: Count Lines, Words and Bytes
Count lines, words, characters and bytes with wc, count files and matches in pipelines, find the longest line, and avoid common counting mistakes.
GNU screen: Run Commands That Survive SSH Disconnects
Use GNU screen to keep processes running after logout: start, detach and reattach sessions, windows, split regions, scrollback and logging.
Regular Expressions on Linux: Practical Guide for grep, sed, awk
Regex for Linux admins: anchors, character classes, quantifiers, groups, BRE vs ERE vs PCRE, with examples for searching logs and editing configs.
ext4 vs XFS (vs Btrfs): Which Linux Filesystem for a Server?
ext4 vs XFS vs Btrfs for Linux servers: performance, resizing (XFS can't shrink), snapshots and checksums, databases, repair tools, and distro defaults.
Fix Locale Warnings on Linux: Set LANG and Generate Locales
Fix setlocale and perl locale warnings: generate locales, set LANG with localectl, stop SSH forwarding your local locale, and use C.UTF-8.
nmap Command: Scan Your Own Server for Open Ports (Examples)
Audit your own server with nmap: scan TCP and UDP ports, detect services and versions, check the firewall from outside, and read open vs filtered results.
jq Tutorial: Parse and Transform JSON on the Linux Command Line
Learn jq for server work: pretty-print JSON, select fields, filter arrays, transform data, raw output for scripts, curl and APIs, Docker inspect, JSON logs.
Fish Shell on Linux: Install, Configure and Key Differences
Try the fish shell: install, autosuggestions, config.fish, abbreviations, functions, fish_add_path, plugins, and how fish syntax differs from bash.
PATH Variable in Linux: View, Add Directories Permanently
How the Linux PATH variable works: command lookup, adding directories temporarily or permanently, sudo and cron PATH issues, command not found.
Linux cgroups v2 Explained: Limit CPU, Memory and I/O
cgroups v2 explained: how systemd and Docker use them, limiting CPU, memory and I/O for services, systemd-run and systemd-cgtop, and cgroup OOM kills.
Linux Swap: Check Usage, Add a Swap File, Tune Swappiness
Check swap usage, find swapped-out processes, add or resize a swap file, tune vm.swappiness, clear swap safely, and size swap for a server.
Linux find Command: 30 Practical Examples
Master the Linux find command: search by name, type, size, time, permissions and owner, combine conditions, run commands with -exec and delete safely.
curl Command: 30 Practical Examples for HTTP and APIs
Use curl to download files, inspect headers, send JSON to APIs, authenticate, follow redirects, test HTTPS, measure timings and debug web servers.
/etc/fstab Explained: Mount Disks Automatically at Boot
Write /etc/fstab entries safely: the six fields, UUIDs, common options, nofail and _netdev, swap and bind mounts, testing, and fixing boot failures.
BorgBackup vs restic: Which Backup Tool Should You Use?
BorgBackup vs restic: storage backends, encryption, deduplication and compression, speed, append-only protection, borgmatic and Backrest, and which to choose.
Btrfs on Linux: Subvolumes, Snapshots and Compression
Use Btrfs on a server: subvolumes, read-only snapshots, rollback, send/receive backups, zstd compression, scrubs, and checking real disk usage.
TRIM on Linux: fstrim.timer vs discard for SSDs and VPS Disks
What TRIM does for SSDs and virtual disks: checking support with lsblk, fstrim.timer vs the discard mount option, manual fstrim, LVM and LUKS, and VPS tips.
Cron Job Not Running? 12 Causes and How to Fix Each
Troubleshoot cron jobs that don't run: the cron service and logs, crontab syntax, PATH and environment, permissions, % characters, time zones, and output.