Question 6

Output E is a valid result of the command last.

Output E, which indicates that the root user logged in on tty2 for a specific time frame, accurately reflects the type of information provided by the last command, which tracks user logins.

A) 1 ls test.txt 2 cat test.txt 3 logout

This output describes various commands that do not relate to user login sessions. The last command does not produce a list of executed commands but rather shows login history, making this option incorrect.

B) Password for user last changed at Sat Mar 31 16:38:57 EST 2018

While this output pertains to user account management, it does not relate to login sessions or displays produced by the last command. Therefore, it is not a suitable output option for this question.

C) Last login: Fri Mar 23 10:56:39 2018 from server.example.com

Although this output shows login information, it is formatted differently from the outputs produced by the last command, which typically lists users in sessions and their times in a different structure. Thus, this option does not qualify as a correct output of the last command.

D) EXT4-fs (dm-7): mounted filesystem with ordered data mode. Opts: (null)

This option pertains to filesystem status messages and has no relevance to user login sessions. As such, it does not represent an output of the last command, making it incorrect.

E) root tty2 Wed May 17 21:11 - 21:11 (00:00)

This output indicates a successful login by the root user on tty2 for a specified duration, which aligns perfectly with the function of the last command. It provides specific login session data that the command is designed to display.

Conclusion

Output E is definitively correct as it accurately reflects the information provided by the last command regarding user logins. All other options either relate to different command outputs or do not conform to the expected format of login information, confirming that E is the only valid choice.