Linux Commands | 2DayGeek

How to Mapping Linux Block Devices to Storage LUNs

May 25, 2022June 10, 2022 - by Vinoth Kumar - 2 Comments.

In some cases, you may need to find a block device mapped against a logical unit number (LUNs) for filesystem (FS) expansion or disaster recovery (DR) activity. Also, this information …

fsck / Linux Administration / Linux Commands / LVM

How to Check and Repair EXT4 Filesystem in Linux

December 13, 2021December 13, 2021 - by Magesh Maruthamuthu - 2 Comments.

The fsck (stands for File System Consistency Check) is used to check and repair one or more Linux filesystems. This check will run automatically at boot time when a filesystem …

Linux Administration / Linux Basic / Linux Commands

How to Remove Multiple Files at once on Linux

December 6, 2021December 7, 2021 - by Magesh Maruthamuthu - Leave a Comment

Deleting (or removing) a file in Linux from the command line can be done using the rm command. It allows you to delete more than one files at once. Also, …

Linux Commands

How to Run Multiple Commands at once in Linux

December 2, 2021December 2, 2021 - by Magesh Maruthamuthu - 2 Comments.

As a Linux administrator, you may know how useful the command line can be to work with various activity such as installing the application, installing the system patch, and restarting …

FAQ / Linux Administration / Linux Basic / Linux Commands

Linux tee command with examples

July 14, 2021July 14, 2021 - by Magesh Maruthamuthu - Leave a Comment

The tee command reads standard input (stdin) and writes the result to standard output (stdout) and one or more files simultaneously. It basically displays the command output on the terminal …

FAQ / Linux Administration / Linux Basic / Linux Commands / security

How to configure firewalld rules in Linux

May 3, 2021May 6, 2021 - by Magesh Maruthamuthu - 3 Comments.

The firewall is essential for controlling the flow of network traffic in and out of the Linux server. It enables users to control incoming network traffic on host machines by …

FAQ / Linux / Linux Administration / Linux Commands / Log Analysis / Log Monitoring / Log Viewer

How to use journalctl to analyze logs in Linux

March 18, 2021March 22, 2021 - by Magesh Maruthamuthu - 1 Comment

systemd is the default system manager in most of the major Linux distributions, which comes with a new logging daemon called ‘journald’. For many years, system and kernel logs in …

Disk IO / FAQ / Hard Disk Monitoring / Linux Administration / Linux Commands

6 best tools to monitor disk IO performance in Linux

March 2, 2021March 18, 2021 - by Magesh Maruthamuthu - 6 Comments.

Disk IO issues (input/output) are one of the most common causes of poor performance on Linux system. This occurs when applications try to quickly read or write too much data …

Linux / Linux Administration / Linux Basic / Linux Commands / Shell Script / User Management

How to lock & unlock multiple users in Linux

February 23, 2021February 24, 2021 - by 2daygeek - 4 Comments.

‘usermod’ & ‘passwd’ commands are used to lock or unlock one user account at a time, but you may need to write some small shell scripts to perform this action …

Linux / Linux Commands / secure shell / security / ssh

How to Automatically Accept SSH Key Fingerprint

December 21, 2020August 9, 2021 - by Magesh Maruthamuthu - 3 Comments.

SSH Secure Shell is an encryption network protocol that provides secure encrypted communications between two hosts. It allows you to connect to a remote machine securely over an insecure network. …