010-160 System Security & User Permissions 4

Question 1

Which file contains the list of all groups on a Linux system?

Accepted Answer

/etc/group

Answer

/etc/group stores group definitions including group name, GID, and member list.

Question 2

A script has the SGID bit set. What happens when it executes?

Accepted Answer

It runs with the privileges of the file's group owner

Answer

The Set Group ID (SGID) bit causes execution with the file group's privileges rather than the caller's group.

Question 3

Which command is used to set an expiry date for a user's password?

Accepted Answer

chage -E

Answer

`chage -E YYYY-MM-DD username` sets the date on which the account expires.

Question 4

What permission does 'r' grant on a directory?

Accepted Answer

Allows listing the directory's contents

Answer

Read permission on a directory allows listing its contents with `ls`.

Question 5

Which command would display the last time each user logged in?

Accepted Answer

lastlog

Answer

`lastlog` reads /var/log/lastlog and shows the most recent login time for every user account.

(010-160) LPI Linux Essentials Practice Test