Question

Consider the following statements :

(a) UNIX provides three types of permissions

* Read

* Write

* Execute

(b) UNIX provides three sets of permissions

* permission for owner

* permission for group

* permission for others

Which of the above statement/s is/are true ?

1. Only (a)
2. Only (b)
3. Both (a) and (b)
4. Neither (a) nor (b)

Answer 1

Correct Answer - Option 3 : Both (a) and (b)

The correct answer is option 3.

EXPLANATION 
UNIX provides three types of permissions using octal numbers
1. Read(R or 4)
2. Write (W or 2)
3. Execute (X or 1)
UNIX provide three sets of permissions. For each set of permission, we are having 3 types of permissions.

permission for the owner(RWX or 421)
permission for a group(RWX or 421)
permission for others(RWX or 421)

• We can change/modify permissions using chmod, chown, etc...commands.
• We can see the permissions for file using -l command

Hence the correct answer is Both (a) and (b).