Which command can be used to display a text file's contents in reverse order and why might a user want to do this?

What will be an ideal response?

You can use the tac command ("cat" spelled backward) to display a text file's contents in reverse order. The main purpose of this command is to display log files, which are text files in the /var/log directory containing information gathered about the system. Displaying these files in reverse order means the most recent events are shown first, which is more helpful when troubleshooting.