I am Linux user with no knowledge on security , up to now i dont know that is my system was in attack or not . I havent felt anything wrong with my system . but every Computer user must have some knowledge on basic system security . so what are the basic things/methods i need to follow the check the security of system and to protect it .
closed as not a real question by Jeff Ferland♦, Iszi, Rory Alsop♦ May 26 '12 at 7:53
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.
You may be interested in a Linux hardening guide. There are copious amounts of articles online which cover how to secure your operating system. Here are a few:
I agree with Jeff, your post is much to vague to receive any kind of constructive information. Are you a system administrator or are you trying to secure a personal Linux machine? Is this a server or a workstation?