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Debian / Linux / Linux Commands / Linux Mint / ubuntu

How to List and Remove a GPG key in Ubuntu

December 11, 2020March 24, 2021 - by Magesh Maruthamuthu - Leave a Comment

Some time ago we wrote an article about removing the PPA repository from the Ubuntu system. The PPA repository keys will not be removed as part of removing the PPA …

How to List and Remove a GPG key in Ubuntu Read More
Disk Partition / Linux / Linux Commands / Logical Volume Management / Logical Volume Manager / LVM

How to Remove Physical Volume from a Volume Group in LVM

October 8, 2020July 30, 2021 - by Magesh Maruthamuthu - 1 Comment

If a device is no longer needed by LVM, you can use the ‘vgreduce’ command to remove that physical volume from it’s volume group. The ‘vgreduce’ command shrinks the capacity …

How to Remove Physical Volume from a Volume Group in LVM Read More
CentOS / Linux / Linux Commands / Oracle Linux / RHEL

How to Scan\Detect new LUN’s & SCSI disks in Linux

September 2, 2020February 22, 2023 - by Magesh Maruthamuthu - 1 Comment

When building a Linux server, it is inevitable to map the storage to save any database and application files which require more storage space. To add storage to the host, …

How to Scan\Detect new LUN’s & SCSI disks in Linux Read More
Arch Linux / CentOS / Debian / fedora / Howtos / Linux / Linux Advanced Commands / Linux Commands / Linux Mint / Linux-Distributions / linux-tutorials / opensuse / Oracle Linux / Red Hat / Red Hat Enterprise Linux / RHEL / ubuntu

How to Convert Text Files between Unix and DOS (Windows) Formats

August 18, 2020August 18, 2020 - by Magesh Maruthamuthu - 1 Comment

As a Linux administrator, you may have noticed some requests from developers to convert files from DOS format to Unix format, and vice versa. This is because these files were …

How to Convert Text Files between Unix and DOS (Windows) Formats Read More
Howtos / Linux / Linux Administration / Linux Basic / Linux Commands

How to Kill user sessions in Linux

July 28, 2020February 17, 2021 - by Magesh Maruthamuthu - Leave a Comment

Sometimes we might need to kill a user session in Linux based on requests, which can be done by sending SIGNALS with kill command. We need to send one of …

How to Kill user sessions in Linux Read More
Howtos / Linux / Linux Administration / Linux Basic / Linux Commands / User Management

How to become a ‘root user’ in Linux?

July 21, 2020January 25, 2021 - by Magesh Maruthamuthu - Leave a Comment

root user is a privileged user in Linux, which is similar to an administrator in Windows. All kind of administrative operations can be performed using root user privilege hence it …

How to become a ‘root user’ in Linux? Read More
Arch Linux / CentOS / Debian / fedora / Howtos / Linux / Linux Advanced Commands / Linux Commands / Linux Mint / Linux-Distributions / linux-tutorials / opensuse / Oracle Linux / Red Hat / Red Hat Enterprise Linux / RHEL / ubuntu

How to Mount and Unmount File System/Partition in Linux

July 7, 2020July 7, 2020 - by Magesh Maruthamuthu - Leave a Comment

Generally, a file system must be mounted on a Linux system to access the contents. When adding a new hard disk to your system, you may need to use the …

How to Mount and Unmount File System/Partition in Linux Read More
Hard Link / Howtos / Linux / Linux Commands / Soft Link / Symbolic Link

Difference between Soft link vs Hard link

May 28, 2020January 26, 2021 - by Magesh Maruthamuthu - Leave a Comment

Link is a mechanism of creating a shortcut to the original file or directory which contains information about its files or directories. What is Soft link? A symbolic link, also …

Difference between Soft link vs Hard link Read More
Howtos / Linux / Linux Administration / Linux Advanced Commands / Linux Commands

How to Remove files older than ‘N’ days using Tmpwatch/Tmpreaper on Linux

May 20, 2020January 11, 2021 - by Magesh Maruthamuthu - Leave a Comment

You may have missed to delete some files that are no longer needed on your computer in some directory. It could be either in “Download” or any other directory that …

How to Remove files older than ‘N’ days using Tmpwatch/Tmpreaper on Linux Read More
FAQ / Linux / Linux Administration / Linux Basic / Linux Commands

How to execute a command or script at reboot or startup

May 13, 2020April 21, 2021 - by Magesh Maruthamuthu - 1 Comment

Well-known services in Linux can be added on boot time without any problems, because most of them come with their own script, which is done using ‘chkconfig’ and ‘systemctl’ commands. …

How to execute a command or script at reboot or startup Read More

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