Linux admins: stop building reports manually.

Learn how to create practical Bash reporting scripts that collect metrics, generate structured reports, log results, handle failures, and run automatically with cron.

A step-by-step guide with real-world examples.

🔗 https://www.linuxteck.com/learn-to-build-bash-reporting-scripts/

#LinuxTeck #Linux #Bash #SysAdmin #DevOps #Automation #ShellScripting #OpenSource #LinuxLearning

Linux runlevels and systemd targets don't have to be confusing.

Learn:
• Runlevel meanings (0–6)
• Systemd target mapping
• Multi-user vs graphical mode
• Checking current target
• Changing default boot mode

Read more:
https://www.linuxteck.com/systemd-targets-boot-modes-linux-explained/

#linuxteck #Linux #Systemd #RHEL #SysAdmin #DevOps #LinuxLearning

KaOS Linux 2026.06 officially switches from systemd to Dinit.
Learn why the project made this change, what's new in this release, and the latest KDE updates.
🔗 https://www.linuxteck.com/kaos-dinit-2026-06-stable-release/
#Linux #KaOS #Dinit #Systemd #OpenSource #LinuxTeck

Top 70 Shell Scripting Environment Setup Interview Questions for Beginners (Part 3/8)
Build a strong Bash foundation by learning shell scripting basics, shebang, executable permissions, PATH, environment variables, and common interview questions.
📖 https://www.linuxteck.com/shell-scripting-environment-setup-guide/
#linuxteck #Linux #Bash #ShellScripting #DevOps #RHCSA

How do you systematically troubleshoot systemd service failures on Linux?
Post:
One of the biggest challenges for Linux admins is identifying why a systemd service fails to start. I put together a practical guide that covers a structured troubleshooting workflow using systemctl, journalctl, dependency analysis, permissions, exit codes, timeout issues, and automatic restart policies.
It also includes production-friendly examples and common mistakes to avoid.
Guide:
https://www.linuxteck.com/fix-systemd-service-errors-complete-guide/

Quick Linux Tip #1

Question:How do I change a string in all files at once?

Try:find . -type f -name '*.txt' -exec sed -i 's/old/new/g' {} +

Info:Use find with sed to search and replace text across multiple files efficiently. The -i flag edits files in place.

Examples:

$ find . -name '*.py' -exec sed -i 's/import os/import sys/g' {} +

$ grep -rl 'TODO' . | xargs sed -i 's/TODO/DONE/g'

$ find /var/www -name '*.php' -exec sed -i 's/old/new/g' {} +

Note:Always backup before bulk editing. Use grep -rl first to preview what will change.

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Understanding the Linux filesystem is one of the most important skills for every Linux user.

Learn about:
📂 FHS
📁 Inodes
💾 ext4, XFS & Btrfs
🖥 Mount points
⚙️ Essential filesystem commands
✅ Best practices

Read more:
https://www.linuxteck.com/linux-file-system-fundamentals/

#LinuxTeck #Linux #LinuxFilesystem #SysAdmin #DevOps #OpenSource

Quick Linux Tip #2

Question:How do I clean up old log files automatically?

Try:sudo find /var/log -name '*.log' -mtime +30 -delete

Info:Delete log files older than 30 days. The -mtime +30 finds files modified more than 30 days ago. Use sudo because /var/log files are owned by root.

Examples:
$ sudo find /var/log -name '*.log' -mtime +30 -delete
$ find ~/Downloads -type f -size +1G -delete
$ find /tmp -name '*.tmp' -mtime +7 -delete

Note:Use sudo for system directories. Use -ls first to preview what will be deleted. Deletion is permanent.

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See less

Getting started with Kali Linux?

This complete installation guide walks you through every step—from downloading the correct ISO to your first login and post-installation setup.

📖 https://www.linuxteck.com/install-kali-linux-step-by-step/

#KaliLinux #Linux #CyberSecurity #EthicalHacking #OpenSource #linuxteck

Quick Linux Tip #3

Question:How do I backup files fast, only copying changes?

Try: rsync -avz --delete /source/ /destination/

Info: rsync only transfers changed files, making backups much faster. -a archive, -v verbose, -z compress.

Examples:

$ rsync -avz /home/user/ /mnt/backup/
$ rsync -avz --delete remote:/data/ /local/backup/
$ rsync -avz --exclude='*.tmp' /src/ /dst/

Note: Use --dry-run first. A trailing slash (/source/) copies contents; omitting it (/source) copies the folder itself.

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AI agents are transforming modern DevOps by automating Infrastructure as Code (IaC), deployments, monitoring, and self-healing workflows.

If you're curious how natural language can become working infrastructure, this guide walks through the complete process.

https://www.linuxteck.com/ai-agents-for-devops-automation-guide/

#linuxteck #DevOps #AI #Linux #Terraform

Quick Linux Tip #4

Question:How long does my script take and how much CPU does it use?

Try:time ./backup.sh

Info:time command shows execution time. real=wall clock, user=CPU for program, sys=CPU for system calls.

Examples:

$ time ./deploy.sh
$ /usr/bin/time -v ./process.py
$ time tar -czf backup.tar.gz /home/data

Note:Use /usr/bin/time -v for detailed resource usage including memory.

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Linux Kernel 7.2 RC1 has landed!
Discover the biggest changes, including 43.8M+ lines of code, PCIe fixes, Rust updates, security improvements, and legacy driver cleanup.
Read the full guide:
https://www.linuxteck.com/linux-kernel-7-2-rc1-release/
#linuxteck #Linux #LinuxKernel #OpenSource #DevOps #SysAdmin

Quick Linux Tip #5

Question:How do I schedule tasks to run automatically?

Try:crontab -e

Info:crontab -e opens editor for scheduled tasks. Format: minute hour day month weekday command.

Examples:
$ crontab -e
$ crontab -l
$ crontab -r

Note: Use journalctl -u cron to inspect active execution logs. Always use full path variables in your commands.

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CachyOS June 2026 delivers another solid update with Python Extended PGO, GCC performance tuning, Hyprland Noctalia, DNS-over-QUIC, improved installer experience, and better multi-GPU support.

Read the full breakdown:
https://www.linuxteck.com/cachyos-june-2026-release/

#linuxteck #Linux #CachyOS #ArchLinux #OpenSource #LinuxNews

Quick Linux Tip #6

Question: What files is a specific process using?

Try: lsof -p 3456

Info: lsof shows all files, sockets, and connections used by a process. Great for troubleshooting.

Examples:

$ lsof -p 3456
$ lsof -i :8080
$ lsof -u username

Note:Use -i for network connections. -i :PORT shows process using that port.

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Quick Linux Tip #7

Question: How do I speed up processing many files using all CPU cores?

Try: find /images -name '*.jpg' | parallel -j+0 'convert {} -resize 800x600 {}.resized'

Info: GNU parallel executes commands in parallel across all CPU cores. Dramatically speeds up batch processing of files, downloads, or any repeatable task.

Examples:

$ parallel -j 4 gzip ::: *.log
$ cat urls.txt | parallel -j 10 wget {}
$ find . -name '*.mp4' | parallel ffmpeg -i {} -vcodec h264 {.}.mp4

Note:Install: apt install parallel. -j+0 uses all cores, -j N uses N processes. ::: passes arguments directly. Perfect for CPU-intensive tasks.

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The Linux batch command lets you queue heavy jobs and automatically runs them when the system load is low.
A handy tool for backups, compression, maintenance tasks, and automation.
Read the guide:
https://www.linuxteck.com/batch-command-in-linux/
#Linux #DevOps #SysAdmin #Automation #linuxteck

Linux PAM controls authentication for SSH, sudo, login, and many other services.

This guide explains how PAM works, the authentication flow, configuration files, common modules, and real-world use cases with easy-to-follow diagrams.

https://www.linuxteck.com/linux-pam-architecture-explained/

#linuxteck #Linux #SysAdmin #DevOps #CyberSecurity

Quick Linux Tip #9

Question: How do I see all processes with their container and resource limits?

Try: systemd-cgls --unit=docker.service

Info: systemd-cgls shows the cgroup tree with all processes organized by their control groups. Perfect for understanding container isolation and resource allocation.

Examples:

$ systemd-cgls --unit=user.slice
$ systemd-cgtop # Real-time cgroup resource usage
$ cat /proc/1234/cgroup # Show cgroups for specific PID

Note: Understand container resource isolation. Combine with 'systemd-cgtop' for real-time CPU/memory per cgroup. Essential for container troubleshooting.

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Quick Linux Tip #10

Question: How do I capture only specific HTTP traffic to a specific host?

Try: sudo tcpdump -i eth0 -w capture.pcap 'host 192.168.1.100 and port 80 and tcp[13] & 2 != 0'

Info: tcpdump captures network packets with BPF filters. This example captures only SYN packets (TCP handshake start) to a specific host on port 80. Perfect for debugging network issues.

Examples:

$ sudo tcpdump -i any -n 'port 443 and host github.com'
$ sudo tcpdump -i eth0 -A 'tcp port 80' # Show ASCII payload
$ sudo tcpdump -r capture.pcap 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn'

Note: Use -w to save, -r to read pcap files. BPF filters: 'tcp[13] & 2' checks SYN flag. Open .pcap files in Wireshark for GUI analysis.

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