Linux Introduction

LINUX

What is Linux

Linux is, in simplest terms, an operating system. It is the software on a computer that enables applications and the computer operator to access the devices on the computer to perform desired functions.Linux's kernel (the central part of the operating system) was developed by Linus Torvalds at the University of Helsinki in Finland.

Kernal

Each operating system uses a kernel. Without a kernel, you can’t have an operating system that actually works.

The kernel’s job is to talk to the hardware and software, and to manage the system’s resources as best as possible.

It talks to the hardware via the drivers that are included in the kernel

Architecture

Find Commands

alias l=lswgetfind . -name tecmint.txtfind /home -name tecmint.txtfind /home -iname tecmint.txtfind / -type d -name Tecmintfind . -type f -name tecmint.phpfind . -type f -name "*.php"

Permission

The Permission Groups used are:owner-ugroup-gall user-o or a

The Permission Types that are used are: r - Read=4 w - Write=2 x – Execute=1

chmod man chown(change the owner or group of the file ) sudo

commands

scpssh(securely login onto remote system)grepcdCd ..

commands

cpvimbashrcifconfig/etc/hosthostname

ps -eaf | grep javakill -9pwd (current Directory)passwd-for change passwordln -s (softlink)ln(hardlink)mkdirrmdir(remove empty directory)rm -rftar zip

How to change the default port of localhost in grails

-Dgrails.server.port.http=8090

Thank You