"Here you are piping the command who, which shows the users
logged in and sending the output into wc which will count the lines
"-l" so come up with a number of users.
"3. Check processes ps aux | grep mingetty
"List all processes that have the text string mingetty. The ps
command with the "aux" options will show all the processes
currently running whether they were started as daemons or users
started them. The grep command is a great tool to search for text