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Analyze, check, auto-repair and optimize Mysql Database
A useful way to do a full check and auto repair damaged databases

Sum columns from CSV column $COL
More of the same but with more elaborate perl-fu :-)

How much RAM is Apache using?
Display the amount of memory used by all the httpd processes. Great in case you are being Slashdoted!

HOME USE ONLY: Get rid of annoying Polkit password prompts
Although the need to type a password to make certain changes to the system may make perfect sense in a business or educational environment, it makes absolutely zero sense to the home user. So, if you’re at home and would rather get work done than be annoyed by what is essentially Linux’s UAC, then this command is for you.

Time Synchronisation with NTP

How to stop MAC Address via IPTables
edit the /etc/sysconfig/iptables file and try to work whit this: -A INPUT -i (interface) -m mac (mac address) -j ACCEPT/DROP

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

processes per user counter
awk is evil!

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

reapair all mySQL/mariaDB databases
while dumping database if you see following error/warning than you have to repair broken tables/rows


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