Question

You need to set the permissions for read, write and execute on a file called SHARE to anyone with an account on the same Linux system. Which of the following commands would NOT have the desired effect?

(A) chmod a+rwx,o=rx SHARE

(B) chmod a+rwx SHARE

(C) chmod ugo=rwx SHARE

(D) chmod 777 SHARE

Answer 1

• In chmod u g o and a, denoted the type of user that has permissions to a particular file. u means current user, g means group member, o means other users, a means all users.
• alos, there are types of permissions r w and x. r means read permission, w means write permission, x means execution permission.
• Now let's analyse the options one by one

A.)

• in this option , o = rw mode sets only read and write permission for other users. So, this option will not have the desired effect.

B.)

• a+rwx mode gives read, write and execute permission to all user. This option will have the desired effect.

C.)

• ugo = rwx will set read , write and execute permission to all three types of users: u g and o
• This option will have the desired effect.

D.)

• 777 is called the persmission number. read permission has value 4, write operation has value 2, execute option has value 1. 7 means all permissions(4+2+1) are granted.
• 777 means all the permissions are granted to all three types of user.

Answer: A