Category Archives: Linux

Articles for Linux

How to Check Linux Version

Posted on October 12, 2025 by Gkhan

If you’re managing a Linux server or desktop, knowing which version of the operating system you’re running is essential. Whether you’re troubleshooting, installing compatible software, or updating your system, identifying your Linux version helps you make the right decisions. In … Continue reading →

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How to Check Disk Usage in Ubuntu 24.04 Server

Posted on October 12, 2025 by Gkhan

Keeping an eye on your server’s disk usage is an essential part of system administration. Running out of disk space can cause application crashes, database corruption, and other serious problems.In this guide, we’ll cover several ways to check disk usage … Continue reading →

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How to install Wireguard on Vicidial 11

Posted on October 12, 2025 by Gkhan

Vicidial 11 is installed on openSUSE Leap 15 . Let’s go step-by-step to install WireGuard on openSUSE Leap 15, openSUSE uses zypper . 🧩 Step 1: Update your system Run this first: ⚙️ Step 2: Install WireGuard package WireGuard is … Continue reading →

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Troubleshooting: Fixing NMTUI Not Working on CentOS 7

Posted on November 11, 2024 by Gkhan

If you’re using CentOS 7 and are having trouble getting NMTUI (NetworkManager Text User Interface) to work properly, you’re not alone. This issue can arise for various reasons, but often, it’s due to improper installation or configuration of the NetworkManager … Continue reading →

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How to schedule a command on linux

Posted on December 20, 2022 by Gkhan

How to schedule a command on linux You can edit the crontab file to execute the command on scheduled time. Below are the examples of crontab . Linux Crontab Format MIN HOUR DOM MON DOW CMD Table: Crontab Fields and … Continue reading →

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How to show line number in nano command

Posted on June 21, 2022 by Gkhan

How to show line number in nano command if you want to show line number in nano command run nano as you run normaly when window is open just press   Alt+Shift+3  it will show line number.

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How to access Centos 7 with windows RDP

Posted on February 12, 2022 by Gkhan

How to access Centos 7 with windows RDP If you want to access your Centos 7 server with windows RDP same as you are accessing windows machine . Then you need the following packege to install xRDP 1- Add epel … Continue reading →

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Peer cert cannot be verified or peer cert invalid

Posted on February 12, 2022 by Gkhan

Peer cert cannot be verified or peer cert invalid while using yum If you are getting above error then perform the following to resolve the yum error. 1- check and correct the date and time of the server. 2- Check … Continue reading →

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How to access data after booting with Sysrcd rescue system

Posted on February 12, 2022 by Gkhan

How to access data after booting with Sysrcd rescue system If you have servers in cloud or rented server on data center . some time its currepted or you need to get databack or edit and currect files. you are … Continue reading →

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centos 5.11 yum repository

Posted on April 2, 2021 by Gkhan

centos 5.11 yum repository It is now EOD no updates available. but we require yum repo to install old applications . go to and run cd /etc/yum.repos.d for i in $(ls *.repo); do mv $i $i.orig; done copy the below … Continue reading →

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