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Intro to Linux – free on edX
Intro to Linux – free on edX from Linux Foundation
Learn Linux with This Free edX Course from the Linux Foundation
Intro to Linux is normally a $2,400 course from the Linux Foundation, but it’s being offered for free now on edX. If you’ve ever wanted to learn how to use the open source operating system, there’s no better time than now.
Source http://lifehacker.com/learn-linux-with-this-free-edx-course-from-the-linux-fo-1612770920
Get IPs connected to your server
This will list you the IPs connected to port 80.
netstat -tn 2>/dev/null | grep :80 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head
Read detailed instructions of it in http://www.mkyong.com/linux/list-all-ip-addresses-connected-to-your-server/