Question

To remove write permission from group and others, which one of the following commands will be used?

(a) chmod  go+w file01

(b) chmod  go-w file01

(c) chmod  ug-w file01

(d) chmod a-w file01

This question was addressed to me by my school principal while I was bunking the class.

This is a very interesting question from Changing File Ownership and Permissions topic in section Basic File Attributes of Unix

Answer 1

The correct option is (b) chmod  go-w file01

For explanation I would say: To remove a certain permission from a category of users we use (-) symbol. So above command will remove write permission from group and others.