UGC NET CSE | June 2016 | Part 3 | Question: 69

Question

In Unix, files can be protected by assigning each one a 9-bit mode called rights bits, now, consider the following two statements:

1. A mode of 641 (octal) means that the owner can read and write the file, other members of the owner's group can read it, and users can execute only
2. A mode of 100 (octal) allows the owner to execute the file , but prohibits all other access

Which of the following statements is correct with reference to above statements?

• A. Only I is correct
• B. Only II is correct
• C. Both I and II are correct
• D. Both I and II are incorrect

Answer 1

Option C is correct.

In Unix the access control of file is done through chmod command. The command is Octal , the three rightmost are for _ _ _

First is for owner

Secod is for group

Third is for others

here rwx is read, write ,execute. They can take the value from 0 through 7 where

#	Permission	rwx
7	read, write and execute	rwx
6	read and write	rw-
5	read and execute	r-x
4	read only	r--
3	write and execute	-wx
2	write only	-w-
1	execute only	--x
0	none	---

641-represent--> the owner can read and write the file, other members of the owner's group can read it, and users can execute only

100 ->the owner to execute the file , but prohibits all other access