commands
The following command will sort all lines and remove duplicates (keeping unique lines):
Uniq - Removing duplicate lines
A userspace utility for testing the memory subsystem for faults. It's portable and should compile and work on any 32- or 64-bit Unix-like system. (Yes, even weird, proprietary Unices, and even Mac OS X.)
memtester version 4
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The GNU Privacy Handbook
Finding open files with lsof
Files are ubiquitous in the UNIX® environment, leading to a common phrase: "Everything is a file."
System accounting in Linux
The TechRepublic CIO50 list celebrates the most influential and innovative tech chiefs, voted by their fellow CIOs The ability to monitor user activity on a Linux system is one of the first skills a Linux administrator should master. This ability often provides a first line of defense in discovering unauthorized activity.