When you first log in to a Unix system, the login program performs various security measures. Which is not one of these security measures?

In an ls listing, 'l' 's' and '-' indicate:

If you use the command sequence: echo 'hello'>file; ln file newfile; rm file; What will happen when you run: cat newfile

How would you print the content of the file in a reverse?

A user reports a problem. In order to gain access to his account in the most secure and non obtrusive way, you...

You inspect the last access time (atime) instead of the last modification time (mtime) in ls output by using the following switch to ls:

Which command would make the scope of a shell variable global to the subshells ?

Pipes is/are :

Using which command can you move to a different directory?

Which command will delete a directory only if it is empty ?

Which command will you use to see your current group?