Linux Foundation Certified System Administrator (LFCS) — Question 55

Which of the following commands will write a message to the terminals of all logged in users?

Answer options

• A. bcast
• B. mesg
• C. print
• D. wall
• E. yell

Correct answer: D

Explanation

The correct answer is D, 'wall', which stands for 'write all' and is specifically designed to send messages to all logged-in users. The other options either do not exist as valid commands for this purpose or serve different functions, such as 'mesg' which controls write permissions, but does not send messages.