Quick Linux Tip #37

Question: My backup is killing disk performance. How do I slow it down?

Try: ionice -c 3 -p $$

Info: ionice sets I/O priority. Class 3 (idle) only allows disk access when no other process needs it.

Examples:
$ ionice -c 3 nice -n 19 rsync -av /src /dst # Throttles CPU + I/O
$ ionice -c 2 -n 7 tar -czf backup.tar.gz /data # Best-effort, low priority
$ sudo ionice -c 1 -n 4 -p 1234 # Real-time priority (root only)

Note: Classes: 1=Real-time (root only), 2=Best-effort (default), 3=Idle. Combine ionice with nice for complete system throttling.

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Archiving & Compression in Linux: tar vs gzip vs xz vs zip Explained
Description:
Master Linux file archiving and compression with this practical guide. Learn when to use tar, gzip, bzip2, xz, and zip, compare their strengths, and discover the essential commands every Linux user should know.
https://www.linuxteck.com/archiving-and-compression-in-linux/
#Linux #LinuxCommands #DevOps #SysAdmin #LinuxTips #OpenSource #LinuxTeck

Why Developers Trust Debian

Debian continues to power servers, cloud workloads, containers, and development environments because of its stability, long-term support, and predictable updates.
Read the complete guide:
https://www.linuxteck.com/why-developers-trust-debian-for-their-work/
#linuxteck #Debian #Linux #OpenSource #DevOps #SysAdmin

Learn Hyprland the Easy Way

Want to start using Hyprland but don't know where to begin?
This practical guide walks through installation, configuration, keybindings, Lua support, and screen sharing so you can build your first productive Wayland desktop with confidence.
📖 https://www.linuxteck.com/learn-hyprland-the-easy-way/
#linuxteck #Hyprland #Wayland #Linux #OpenSource #ArchLinux #Ubuntu

Quick Linux Tip #38

Question: How do I make my custom app automatically restart on crash?

Try: sudo systemctl edit --force --full myapp.service

Info: Restart=on-failure restarts the app on non-zero exits/crashes, while RestartSec adds a delay before restarting. Use StartLimitBurst in [Unit] to prevent infinite crash loops.

Examples:
$ sudo systemctl status myapp # View service status
$ sudo journalctl -u myapp -f # Follow application logs in real-time
$ sudo systemctl reset-failed myapp # Reset crash rate limits

Note: Restart modes include no, always, on-failure, and on-abnormal. always triggers even on clean exits (0), whereas on-failure is recommended for standard services.

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Master Linux Job Control

Working in the Linux terminal?
Learn how to use &, jobs, fg, bg, and Ctrl+Z to manage long-running commands without losing your workflow.
A practical guide with real-world examples for Linux users and system administrators.
https://www.linuxteck.com/job-control-fg-bg-jobs/
#linuxteck #Linux #Bash #Shell #DevOps #OpenSource

Quick Linux Tip #40

Question: Which files changed during the incident window last Tuesday?

Try: find /var/www -type f -newermt '2026-07-23 14:00:00' ! -newermt '2026-07-23 16:00:00'

Info: -newermt 'DATE' matches files modified AFTER a timestamp. Combined with ! -newermt, it isolates files modified BETWEEN two specific times—ideal for forensic analysis.

Examples:
$ find / -newermt '1 hour ago' -type f 2>/dev/null # Modified in the last hour
$ find /home -newermt yesterday ! -newermt today # Modified yesterday only
$ find /etc -newermt '2026-07-01' ! -newermt '2026-07-31' -type f # Within date range

Note: Supports natural language strings like 'yesterday', '1 hour ago', or 'last week'. You can also use -newerct (change time) or -neweramt (access time).

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Quick Linux Tip #41

Question: How do I find duplicate files even if they have different names?

Try: find /home/linuxteck -type f -exec md5sum {} + | sort | uniq -w32 -D

Info: md5sum hashes file contents, sort groups identical hashes, and uniq -w32 -D compares the 32-character hash to output all duplicate files.

Examples:
$ find . -type f -exec md5sum {} + | sort | uniq -w32 -d # Show 1 sample per duplicate set
$ fdupes -r /home/linuxteck # Dedicated tool (apt install fdupes)
$ rdfind -deleteduplicates true /home/linuxteck # Auto-delete duplicates safely

Note: For large directories, fdupes or rdfind are purpose-built and significantly faster. Use sha256sum instead of md5sum if collision risk is a concern.

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Linux DNS Troubleshooting Made Easy

DNS failure on Linux? Start with evidence instead of restarting services.
This practical workflow covers connectivity, /etc/resolv.conf, dig, NSS lookup order, systemd-resolved, NetworkManager, containers, and automated DNS health checks.
Useful for Ubuntu, Rocky Linux, and RHEL admins.
Read the full guide : https://www.linuxteck.com/linux-dns-troubleshooting-made-easy/
#LinuxTeck #Linux #DNS #DevOps #SysAdmin #LinuxAdministration

Quick Linux Tip #42

https://www.linuxteck.com/linux-tips/tee-command-linux/

Tip Question: How do I watch a long command run AND save its complete output?

Try: ./deploy.sh 2>&1 | tee -a deploy.log

Info: tee splits stdout to both terminal and file. 2>&1 redirects stderr into stdout first to capture error logs. -a appends output instead of overwriting.

Examples:
$ ./script.sh 2>&1 | tee output.log # Overwrite log with output + errors
$ make 2>&1 | tee build.log | grep -E 'error|warning' # Log all, filter display
$ sudo apt upgrade 2>&1 | tee -a /var/log/upgrades.log # Append system upgrade log

Note: Without 2>&1, tee only captures standard output and misses error messages. Use tee -a when running repeated scripts to maintain a history.

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Quick Linux Tip #43 https://www.linuxteck.com/linux-tips/linux-tips-sed-extract-text-between-markers/

Question: How do I extract config values from between BEGIN and END markers?

Try: sed -n '/BEGIN CERTIFICATE/,/END CERTIFICATE/p' /etc/ssl/certs/server.crt

Info: sed -n suppresses automatic printing. The pattern '/START/,/END/p' prints all lines between two matching delimiters (inclusive).

Examples:
$ sed -n '/^\[database\]/,/^$/p' config.ini # Extract section until empty line
$ awk '/BEGIN/,/END/' file.txt # Equivalent using awk
$ sed -n '/ERROR/,+5p' logfile # Print ERROR line plus next 5 lines

Note: Range matching /X/,/Y/ works line-by-line from first match of X to next match of Y. The +N relative line count syntax is a GNU sed extension.

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Your DevOps Skills Aren’t Complete Without Networking
Caption:
A lot of “application problems” are actually networking problems. This guide covers a practical approach to troubleshooting DNS, routes, ports, firewalls, SSH, IPv6, and cloud networking on Linux.
Read the guide → https://www.linuxteck.com/networking-skills-for-devops/
#LinuxTeck

Quick Linux Tip #44 : https://www.linuxteck.com/linux-tips/linux-tips-check-tcp-packet-loss-ss/

Question: My connections feel unreliable. How do I check for hidden packet loss?

Try: ss -ti | grep -A3 'ESTAB' | head -20

Info: ss -ti dumps TCP internal metrics. Look for retrans:X/Y (X current retransmits, Y total) and rtt (round-trip time). Non-zero retransmits signal packet loss or network congestion.

Examples:
$ ss -ti state established '( dport = :443 )' # Inspect HTTPS connections
$ watch -n 1 'ss -s' # Monitor overall socket summary
$ netstat -s | grep -i 'retrans\|reset' # Global TCP retransmission counters

Note: When retransmissions occur, cwnd (congestion window) shrinks automatically. Persistent retransmits across multiple endpoints point to network hardware issues rather than application bugs.

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Quick Linux Tip #45 - https://www.linuxteck.com/linux-tips/fix-windows-file-encoding-linux/

Question: My Windows files have wrong encoding on Linux. How do I fix them all?

Try: find . -name '*.txt' -exec sh -c 'iconv -f WINDOWS-1252 -t UTF-8 "$1" -o "$1.utf8" && mv "$1.utf8" "$1"' _ {} \;

Info: iconv converts text encodings (-f=from, -t=to). Wrapping in sh -c enables chaining iconv and mv per file. The _ acts as a placeholder for $0 in the subshell.

Examples:
$ iconv -f UTF-16 -t UTF-8 windows.txt -o linux.txt # Convert single file
$ iconv -l | grep -i utf # List all supported UTF encodings
$ dos2unix *.txt # Fix CRLF line endings only

Note: Always test on a backup copy first! Use iconv -l to see all supported charsets. Use dos2unix if you only need to fix line endings (CRLF to LF).

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Quick Linux Tip #46 : https://www.linuxteck.com/linux-tips/lvm-snapshot-rollback-linux/

Question: I'm about to make risky changes. How do I create a rollback point?

Try: sudo lvcreate --snapshot --name pre_upgrade_snap --size 10G /dev/ubuntu-vg/root

Info: LVM snapshots freeze filesystem state instantly. They store only changed blocks post-creation, making 10G ideal for temporary changes. Merge to rollback.

Examples:
$ sudo lvcreate -s -n snap1 -L 5G /dev/vg0/mysql # Create MySQL snapshot
$ sudo lvremove /dev/vg0/snap1 # Discard snapshot without merging
$ sudo btrfs subvolume snapshot /home /home.snap # Btrfs alternative

Note: Requires LVM or Btrfs. Copy-on-write introduces a slight write penalty. Merging a root filesystem snapshot requires a system reboot. Perfect before major upgrades.

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Quick Linux Tip #47 : https://www.linuxteck.com/linux-tips/recover-deleted-files-linux/

Question: I deleted a file 5 minutes ago and there's no backup. Can I recover?

Try: sudo debugfs -R 'lsdel' /dev/sda1 | tail -20

Info: debugfs is a low-level ext filesystem tool. lsdel lists deleted inodes, and dump <inode> <file> restores content. Works only if blocks haven't been overwritten yet.

Examples:
$ sudo debugfs /dev/sda1 # Interactive filesystem mode
$ sudo extundelete --restore-all /dev/sda1 # Automated bulk recovery tool
$ sudo photorec # Universal block recovery across any filesystem

Note: Stop writing to the partition immediately after deletion to prevent overwriting raw blocks. debugfs is specific to ext2/3/4.

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Verpex Review 2026: What You Need to Know

We went beyond the promotional price and tested what Verpex is actually like to use.
Performance, load testing, migrations, support, security, pricing, renewal costs, and plan limitations are all covered in this 2026 review.
Verdict: Yes, for the right buyer.
Read the review → https://www.linuxteck.com/guides/verpex-reviews/
#LinuxTeck #Verpex #WebHosting #Linux

Quick Linux Tip #48 :https://www.linuxteck.com/linux-tips/python-http-server-linux/

Question: How do I quickly share files across my network without setting up nginx?

Try: python3 -m http.server 8080 --bind 0.0.0.0

Info: Python's built-in HTTP server serves the current working directory over HTTP. --bind 0.0.0.0 makes it reachable across all network interfaces on port 8080.

Examples:
$ cd /path/to/share && python3 -m http.server 8000 # Share specific directory
$ python3 -m http.server 8080 --directory /var/www/public # Set dir without cd
$ npx http-server -p 8080 # Node.js alternative

Note: Never use in production—it lacks authentication, HTTPS, and multi-threading. Press Ctrl+C to stop. Check your firewall settings (ufw) if connection times out.

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Zsh vs Fish: Which Linux Shell Is Better?

Zsh or Fish? This practical Linux comparison breaks down the key differences between the two popular Bash alternatives.
Learn about POSIX compatibility, startup performance, scripting, customization, plugins, learning curve, ecosystem, and real-world use cases. Find out when Fish makes sense, when Zsh is the safer choice, and why Bash or sh still matters for portable automation.
Read the complete : https://www.linuxteck.com/zsh-vs-fish/
#LinuxTeck #Linux #Zsh #FishShell #Bash #LinuxTips #DevOps #SysAdmin #LinuxLearning

Quick Linux Tip #49 : https://www.linuxteck.com/linux-tips/compare-config-files-linux-servers/

Question: How do I check if a config file differs between two servers?

Try: diff <(ssh linuxteck@server1 cat /etc/nginx/nginx.conf) <(ssh linuxteck@server2 cat /etc/nginx/nginx.conf)

Info: Process substitution <() combined with SSH pipes file contents directly to diff. No temp files needed. Great for verifying config parity across servers.

Examples:

$ diff <(ssh s1 'rpm -qa | sort') <(ssh s2 'rpm -qa | sort')
$ diff <(ssh s1 'systemctl list-units --state=running') <(ssh s2 'systemctl list-units --state=running')
$ colordiff <(ssh s1 cat /etc/hosts) <(ssh s2 cat /etc/hosts)

Note: Requires SSH key auth (no password prompts). Use with ControlMaster (Tip #16) for speed. colordiff makes output much easier to read.

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DNF vs APT: What actually makes them different?

Most comparisons stop at “APT is for Debian and DNF is for Red Hat.”
This guide goes deeper into how their dependency resolvers behave, DNF5's transaction model, APT's flexibility, rollback differences, automation, and the commands you'll actually use.
🔗 https://www.linuxteck.com/dnf-vs-apt/
#LinuxTeck #Linux #DNF #APT