Rkhunter is a very useful tool that is used to check for trojans, rootkits, and other security problems. This tutorial will touch on installing and setting up a daily report for rkhunter.
Installing:

# wget -c http://downloads.rootkit.nl/rkhunter-1.2.9.tar.gz
# tar -xvf rkhunter-1.2.9.tar.gz
# cd rkhunter-1.2.9
# ./installer.sh

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Howto Install Rkhunter