Added "[USU Mode]" tag to echo to tell user usu.sh is running
Added "[USU Mode]" tag to echo to tell user usu.sh is running

I also did some misc changes to the file, an important change:

IMPORTANT: The script now returns 0 when no error has been detected and -1 when an error occurs. This change should be stable enough to push directly to master.
CP-Team-06-0003/Useful-Scripts,CP-Team-06-0003/Useful-Scripts