ssh setting in ubuntu

A way to set up ssh in ubuntu will be presented.
the detail of ssh manual contains URL below for Korean version.

http://wiki.kldp.org/wiki.php/DocbookSgml/SSH-KLDP

1. install by apt-get

$ sudo apt-get install ssh

2. change port

$ sudo gedit /etc/ssh/sshd_config

# port 22 : remove # then, enable port22 to be active

3. restart demon

$ sudo /etc/init.d/ssh restart

4. confirm whether server works or not

$ netstat -ntl
tcp6        0        0        :::22(port number)       :::*        LISTEN    →   works well