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The system allocate and prioritize resources for processes on the system using nice levels, and in order to change the nice of a specific process, you need to run renice level <process id>
The command dig allows you to get specific domain information, such as A, AAAA, NS, etc' records - you can use dig google.com NS.
The tee command allows you to save data from the standard I/O to a file, you can use it as tail -f /var/log/messages | tee found.log and it will save you only the data that you saw on the tail.
In order to check the runlevel services information for the run levels you need to use the chkconfig: chkconfig –list.
If you want to allow a user to run superuser commands without having superuser (or root) access, you can add him specific (or all) access using sudoers file.
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