Finding out computer hardware from terminal window
 

Hello,
is it possible to find out computer hardware featuer from terminal (console) window? If so, how? Are these informations (CPU's GHz, RAM, HDD...) are written in some file or...?

Thank you.

What exactly do you want to know? There are several ways to get information about the hardware in your machine. You could use lspci or lsusb. You could cat files in /proc. udevtest provides some information.

Some distros have got a tool called lshw installed as default. (You might have to run this as root). It shows a lot of nice information. As mentioned, you could also use lspci and lsdev.
If you don't have lshw installed, it should probably be easy to install :)

dmesg should also help.