I'm looking for the best tool to monitor the Linux system. I've found a lot of interesting tools searching the web but I didn't find one which can do all the requirments (like a one in all tool). I would prefer it to include a command line interface also.

Thank you, Andreea

top to monitor load.
watch df to monitor free space.

Both of these are command line monitor tools.

Nobody here can help you because you haven't provided any details of what your requirements are or what you've looked at and decided not to use.

Try providing more information and you might get a more sensible reply.

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...and since you don't tell us WHAT you want to monitor, or what your requirments are, how do you think we'll be able to tell you what to look at?? There are MANY, but chances are there are absolutely ZERO that can do exactly what you want out of the box. This goes for commercial software and free. You will have to modify or change things to suit your needs.

No such beast exists.

Don't know if this is anything like what you're looking for: dstat.
Haven't used it, just come across during casual browsing.

htop FTW!

Do you mean a monitoring system, like "xymon"? (used to be called "Hobbit", which was derived from "Big Brother" before that).

There's also "Nagios", "Cacti", and "Munin" and no doubt plenty of others I'm not familiar with. I have no idea if these three are still around and supported. I never used these three personally, but I reviewed them. My choice was initially Big Brother (many years ago) and then Hobbit. Big Brother was left to die a slow lingering unsupported death, but then the company came back and tried to revive it. that was after some other company tried a derivitive, Big Sister, that I think went nowhere. But Hobbit had taken over where Big Brother left off and was vastly superior. Hobbit had to be renamed to Xymon a few years ago because some idiototic motion picture industry lawyers thought there might be "consumer confusion" surrounding system monitoring vs. little short people with hairy feet that live in The Shire.