Altera Quartus II Scripting - Manual (Page 121)

Chapter 2: Command-line Executables 2–95
Common Options
© July 2013 Altera Corporation Quartus II Scripting Reference Manual
return_codes
Quartus ® II command-line executables exit with the one of the following return codes.
Return Code Description
0 Execution was successful
2 Execution failed due to an internal error
3 Execution failed due to user error(s)
4 Execution was stopped by the user