I recommend debain. easy to install, and very fast. you might also want to look at slackware, a little bit trickier, but a very fast distro.

is debian like a command line interface?

>is debian like a command line interface?
It is if you don't install X. If you're going to install Debian, I recommend downloading the net-install CD anyway. There's no real reason to download all 20 CDs unless you're installing a lot of X applications without an internet connection.

SuSE is very good, but has requires high specs.

How about Fedora? Is it good for a server?

>How about Fedora? Is it good for a server?
Fedora is the consumer "desktop" distro made by Red Hat. If you want their server distro, you'll want to take a look at Red Hat Enterprise Linux (RHEL), or CentOS, which is essentially a free version of RHEL.

You can try Gentoo Linux. I recomend minimal installation, you will learn a lot of stuff while installing,and also you can setup gentoo to use all your hardware at maximum.its a source based distro.So if you dont alergic in compilation,its a good choice

On the other hand, Gentoo has a software model that might be undesirable for a server operating system. Generally speaking, as a source-based distro, Gentoo tends to be bleeding edge, and while there's a server overlay, that isn't quite enough. Servers OSs need software that's been tried and true, and often need support for legacy software. The Gentoo developers spend very little time backporting and maintainig old packages, so often you're forced to upgrade to the latest -- which may not be the greatest.

CentOS is probably the best choice if you like the RPM package style. You'd probably find a lot of CentOS and RHEL in larger production environments. When I was working IT at a technical college, all we used was RHEL for our Linux courses. Either are probably going to do well for you.

Bill