Who developed UNIX?
1. Ken Thompson
2. Dennis Ritchie, 
3. Douglas Macllroy
4. Ken Thompson, Dennis Ritchie, 
Douglas Macllroy, Rudd Canaday and Tom Blakeley

What is ‘ps’ command for? 
1. prints the status
2. prints the process status
3. prints the execution status
4. none

Which command is used to terminate the process?
1. Wait
2. Sleep
3. kill
4. none

Which commaand is use for the copy in unix?
1. copy
2. cp
3. cpy
4. none

What is stand for IPC?
1. Inter procedure communication
2. Inter process communication
3. Inter part compare
4. None

What is the stand for FIFO?
1. First in First out
2. File in File out
3. First Inter First Out
4. none

What are states that the page can be in, after causing a page fault?
1. On a swap device and not in memory,
2. On the free page list in the main memory,
3. In an executable file,
4. all

At what mode the fault handler executes?
1. execution mode
2. kernal mode
3. operation mode
4. none

Which one data structure is used for Demand Paging?
1. Page table entries,
2. Disk block descriptors,
3. Page frame data table (pfdata),
4. Swap-use table.
5. all

What is stand for BSS in Unix?
1. Block Started by Symbol
2. Black Storted by Symbol
3. Black Started by Symbol
4. none

Which one is best in action between fork() and vfork()?
1. fork()
2. vfork()
3. both
4. none

Which symbol will be used with grep command to match the pattern pat at the beginning of a line?

A.	^pat
B.	$pat
C.	pat$
D.	pat^
E.	None of the above

Which command is used to sort the lines of data in a file in reverse order

A.	sort
B.	sh
C.	st
D.	sort -r
E.	None of the above

Which command is used to display the top of the file?

A.	cat
B.	head
C.	more
D.	grep
E.	None of the above

Which command is used to copy all files having the string chap and any two characters after that to the progs directory?

A.	cp chap?? progs
B.	cp chap* progs
C.	cp chap[12] /progs/*.*
D.	cp chap?? /progs/*
E.	None of the above

Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3?

A.	chmod u+x emp[l-3]
B.	chmod 777 emp*
C.	chmod u+r ??? emp
D.	chmod 222 emp?
E.	None of the above

Which command is used to remove a directory?

A.	rd
B.	rmdir
C.	dldir
D.	rdir
E.	None of the above

Which of the following keys is used to replace a single character with new text?

A.	S
B.	s
C.	r
D.	C
E.	None of the above

Which command is used to extract specific columns from the file?

A.	cat
B.	cut
C.	grep
D.	paste
E.	None of the above

Which command sends the word count of the file infile to the newfile.

A.	wc infile >newfile
B.	wc <infile >newfile
C.	wc infile - newfile
D.	wc infile | newfile
E.	None of the above