Login as root.
Type the following commands:
To stop ssh server, enter:
How to install OpenSSH on Ubuntu
OpenSSH is a FREE version of the SSH connectivity tools that technical users of the Internet rely on. Users of telnet, rlogin, and ftp may not realize that their password is transmitted across the Internet unencrypted, but it is. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection
How to flush iptables on Ubuntu
To see your current rules in iptables (IPv4), enter:
$ sudo iptables -L
To see your current rules in ip6tables (IPv6), enter:
How to stop and start ufw on Ubuntu
ufw command – This command is used for managing a Linux firewall and aims to provide an easy to use interface for the user.
Login as root.
How to install GNOME from Terminal on Ubuntu 12.04
You can also install GNOME Shell from the terminal with the following command:
# sudo apt-get install gnome-shell
To access GNOME Shell, sign out of your current desktop. From the login screen, click the little button next to your name to reveal the session options.
How to reset password in Ubuntu 12.04
Reboot your computer.
Press SHIFT at the grub prompt.
Select your image.
Highlight the line that begins kernel and press e to edit
How to install MongoDB with apt-get command on Ubuntu 12.04
MongoDB is one the popular nosql database.It is a cross-platform document-oriented database system.MongoDB has its interactive shell called mongo .
Login as root.
#apt-get install mongodb-10gen
How to install hwinfo on Ubuntu / Debian
The hwinfo command is a very handy command line tool that can be used to probe for details about hardware components. It reports information about most hardware units like cpu, hdd controllers, usb controllers, network card, graphics cards, multimedia, printers etc.
How to change username in Ubuntu 12.04
login as root:
#usermod -l newname oldname
How to set static DNS in Ubuntu 12.04 LTS
Ubuntu 12.04 use resolvconf(a set of scripts and hooks) instead of resolv.conf to manage DNS server. The most notable difference for the user is that any change manually done to /etc/resolv.conf will be lost as it gets overwritten next time something triggers resolvconf.
