What unix is mac os based on?
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What do you understand by the term single user system?
Write a script that prints out date information in this order: time, the day of week, day number, month, year(sample output: 17:34:51 pdt sun 12 feb 2012)
Describe file systems in 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.
What is piping?
What is unix operating system used for?
How do you switch from any user type to a super user type?
What are data structures that are used for Demand Paging?
What do you mean by unix?
Explain how do we change file access permissions?
You have a file called tonky in the directory honky. Later you add new material to tonky. What changes take place in the directory, inode, and file?
Can you tell me something about wildcard interpretation?
Unix Commands 
