Linux General Commands

For Machine Memory Information
=======================
cat /proc/meminfo
or 
less /proc/meminfo

For Machine CPU Information
=====================
cat /proc/cpuinfo
or
less /proc/cpuinfo

For Getting directory list 
=========================

ls
ls -rt  (sorted list)

For Getting Help
================
man <command name>

Finding size of Main directories in machine
==================================
df -h

Find size of current directory 
==============================
du -sh (for summarized dir size)
du -h

For Creating and Removing Directory
===================================
mkdir
rmdir

To remove the Directory and Sub directories
========================================== 

rm -rf <Directory name>

To kill a process
=================

kill -kill <process id>
or 
kill -9 <process id>

To execute an sh script
=======================

sh <process name .sh>
or 
. <process name .sh>

To move file from 1 directory to other
=======================================

move <file name> <destination directory name>

To move file from one Linux machine to other
============================================

scp <file name> < Destination server user>@< Destination ip address  >:<destination path>

Example:
scp backup.zip oracle@10.0.0.0:/home/oracle/my_dir

Query rpm
=========
rpm -q <rpm name>

• -q query operation
• -a queries all installed packages

rpm -qa --queryformat '%{name-%{version}-%{release} %{size}\n'

Install rpm
===========
rpm -i <rpm name>

rpm command and options

• -i : install a package
• -v : verbose
• -h : print hash marks as the package archive is unpacked.

Extract Tar.gz file
===================
tar -xzvf test.tar.gz

Make tar.gz file
================
tar -czvf test.tar.gz

Reboot server
=============
su - root
reboot