Chapter 1

Question 1

How many fields are in each line of /etc/passwd?

Answer 1

7

Question 2

Which command shows you the owner userid of a file as an integer?

Answer 2

ls -lan

Question 3

Which characters can you use in usernames?

Answer 3

only lowercase letters, digits, and underscores

Question 4

Red Hat recommends system users in what range?

Answer 4

1-499

Question 5

What is the userid of the process with process id (PID) 1?

Answer 5

0

Question 6

What is the problem with this line from /etc/passwd? root::0:0:root:/root:/bin/bash

Answer 6

the superuser account is unpassworded, so anyone can take over the computer

Question 7

What happens if a user’s login shell is set to /sbin/nologin?

Answer 7

that user is not allowed to log in

Question 8

In Red Hat Enterprise Linux, mail, news, and apache are examples of what?

Answer 8

system users

Question 9

The command ps lax can be used to do what?

Answer 9

see userids of all processes on the system

Question 10

The id command shows you what?

Answer 10

userid, username, and group information for the current user