basic - continued

[Amedee Van Gasse]

On 06-02-10 14:26, Odd wrote:

> That is true, but at least a rootkit can't be installed.

amedee at fangorn:~$ apt-cache search rootkit
chkrootkit - rootkit detector
rkhunter - rootkit, backdoor, sniffer and exploit scanner
unhide - Forensic tool to find hidden processes and ports

If a rootkit can't be installed, then why is there software to check for 
rootkits?