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56.
How can you find, who was logged in to the system, the dates, and the amount of time they were logged in?
In order to find the last users logged in to your system you can use "last".
57.
How can you find out which process is using the port 80 on your Linux?
Fuser 80/tcp –v
58.
Where can you find the following configuration: "%admin ALL=(ALL) ALL"
Sudoers configuration.
59.
What is the major change between the ext2 and ext3 file systems?
A NIS server is a Network Information Service and it provides the user the possibility to login to different system with the same credentials.
60.
How can you manipulate incoming and outgoing packets in Linux?
Using iptables
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