Very useful Linux administration commands

I primarily use Linux on my laptop, I have both Ubuntu 12.10 and OpenSUSE 12.2 running on the laptop. And been having at least 2 linux distros on the laptop since 2009.

In this post I will share with you, some very useful linux commands -

man any_command  the manual for target command>

pwd  

ls files in current directory>

ls  –a maximum information about all files, including hidden>

mv source destination  a file or directory>

rm target 

cp source destination  file or directory>

mount /dev/device_name /media/device_name filesytem>

umount /media/device_name <Unmount>

df –h filesystem and available disk space  in KB, MB, GB>

du 

ps – ef all running processes, with full details>

top system monitor showing a more extensive view of all processes and system resources>

nohup command & a process in the background and have it keep running after you log off>

~/  user's home directory>

ifconfig  network interfaces>

iwconfig  wireless network interfaces>

ssh username@ip_address  to a remote server>

ping ip_address  to see if target is online and responding>

traceroute6 ip_address  network route to target>

netstat  

iptables –L  firewall rules>

adduser a new user>

usermod user privileges (be very careful with this one)>

deluser  

chmod <# Change privileges over file or directory >

chown user_name:group_name directory_name owner of a file or directory>

su username  become a different user>

users usernames of logged in users>

Infact, you can administer your mysql database directly from the CLI

CREATE DATABASE databasename; 

CREATE USER username@localhost IDENTIFIED BY 'password'; a new user>

show tables;  database schema>

Know other useful Linux commands? Please share via the comment box.