My friend wanted to know how to change or convert DHCP network configuration to static configuration. After initial installation, he wanted to change network settings. Further, his system is w/o GUI system aka X Windows. Here is quick way to accomplish the same:

Your main network configuration file is /etc/network/interfaces

If I want to download all files in a directory of a website, i have to perform a long wget command, they is what I do at first:

This works fine, but sometimes it gives some silly index.@xx files that wish I do not want. To make your directory clean, if you knows the file format you want, you can do this:

wget -nd -r -l1 --no-parent -A.mp3 -A.wma http://www.foo.com/mp3/

I am going to explain briefly what is the meaning of the options I speficied.
-nd no directory, by default wget creates a dir
-r recursively download
-l1 (L one) level 1, download only of that particular folder, don’t go depth on it.
–no-parent I definately don’t want the parent’s files

Q. How do I open rar archive files under Linux / UNIX operating systems?

A. RAR files are in compressed archive format, if you have downloaded rar files from the Internet, you need to unpack or unrar them (extract rar files).

RAR is a proprietary file format for data compression and archiving, developed by Eugene Roshal.

Under Linux and UNIX, use command called unrar. By default unrar is not being installed on Linux, FreeBSD or UNIX oses. You can install unrar command with the help of apt-get or yum command.
(See below for Windows XP info)