The default is -stop_status=no.
The value must be in the range 0 to 255. Larger values are truncated and a run–time message issued. Note that
STOP ”stop string’
is still accepted and returns a status value of 0 to the environment, although a compiler warning message will be issued.
The environment status variable is $status for the C shell csh, and $? for the Bourne and Korn shells, sh and ksh.