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LINUX

How to setup cron in Linux?

Linux allows user for scheduling future jobs or CRON. Jobs can be scheduled to run only once in the future or repetitively at fix time. While working as a system administrator it is fairly regular to perform certain tasks like taking backup, rotating log files and other tasks. To perform these repetitive tasks Linux has […]

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LINUX

Understand logs and manage logs in Linux

How to manage logs in Linux? JOURNALD  Journal is the system that collects and manages logs – syslog messages, kernel log messages, initial ram disk and early boot messages, messages from running services. In RHEL 7 journald implements the journal and replaces rsyslog as the default log management service. The journald daemon collects data from all available sources and […]

Linux Tutorial
LINUX

Shell Environment and its types

BASH has many Shell Environment variables on which its function depends. The list of environment variables which is set for current session can be listed out using env or printenv commands. $ env $ printenv The Shell Environment is set, as per the configuration distributed in different files. And the list of required bash configuration files are listed below:- […]

Linux Tutorial
LINUX

VIM editor and its related commands

Vim Editor is command line text editor, an enhanced version of ‘vi’. To open a file in vim use below mentioned command:- $ vim myfile There are 2 modes of vim we use. Command mode where we run commands. Insert mode where we do editing. How to access these Modes of VIM? ESC – Command […]

Linux: Filesystem Hierarchy
LINUX

Linux File System Hierarchy

LINUX FILESYSTEM Linux Filesystem is an inverted tree structure which consists folders and files. At the root of the filesystem is ‘/’ (forward slash). Everything under Linux is kept inside ‘/’. When the disk is partitioned, the partitions are attached to one (or more) of the directories in the Linux filesystem. The process of attaching […]

Linux Tutorial
LINUX

Is there any Help available in Linux!!

Manual Pages Manual Pages is one stop help for the commands and utilities in Linux OS. To read the manual pages man command is used. $ man uptime $ man dmidecode One line descriptions of manual pages can be displayed using whatis command. $ whatis uptime $ whatis dmidecode Manual Pages database can be used to search for the […]

Linux Tutorial
LINUX

Let’s understand the SHELL and its working

Details about Command Line Interface In early days of computing, there was no Graphical User Interface. There was only CLI to interact with the computer. Computers back then were very costly and providing personal workstations to individuals was not economical. Mainframe Computers were used for computing by attaching terminal devices to them so that multiple […]

Linux Tutorial
LINUX

Introduction to Linux Operating System

Operating System: Introduction The operating system is the group of software that works together to operate the underlying hardware and provide an interface for user applications. User applications like media player, web browsers, Office Suite or others cannot directly access the computer hardware. It is the OS on which these applications depends to complete their job. […]

Linux Tutorial
LINUX

Linux Installation Guide

How to  create Bootable Media We are now going to install CentOS 7 from a bootable USB drive. To create a bootable USB drive of CentOS 7 we need CentOS 7 iso image file A USB drive with minimum 4GB space Follow the procedure given below to create CentOS 7 bootable USB drive in very easy […]

Linux Tutorial
LINUX

Know about I/O Redirections and Pipe

I/O REDIRECTION There are three standard devices in CLI, they are Standard Input, Standard Output and Standard Error. Default Standard Input device is Keyboard. The screen is the default Standard Output and Standard Error device. Meaning the input is generally given from Keyboard and output and errors are generally displayed on Screen. Sometimes it is required […]