How do you switch from any user type to a super user type?
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What are the entities that are swapped out of the main memory while swapping the process out of the main memory?
Why does the server parent need to close the connected socket returns from accept in a concurrent TCP server? What may happen if it does not do so?
Name the data structure used to maintain file identification?
What are three main elements of unix operating system?
List a few significant features of unix?
1)How to schedule a job,that will periodically execute in second by crontab? 2)I know only second specific time to execute the job. like 10 10 * * * sleep 40&&ps -l>/dev/pts/1 It will execute at 10:10:40 AM but do not know how to execute 15 second,30 second so on at 10:10 am.
1)what is grep|sort give example? 2)what are the test commands
Is unix written in c?
What do you understand by unix shell?
Is a form of interprocess communication in unix?
Is unix still relevant?
briefly describe the shell's responsibilities?
Unix Commands 
