found this AI:
Special Variable RC
The REXX special variable RC normally contains the return code from host
command most recently executed. The special value -3 indicates that the
specified command was not found.
If a system abend occurs, the value returned is the negative of the decimal
value of the abend code. For example, an S0C1 abend would result in RC = -
193. For a user abend, RC is set to the decimal value of the abend code.
If no abend occurs, then RC is set to the decimal value of the return code
returned by the command. For REXX services provided by IBM or other
software vendors, refer to the product documentation for more information on
how to interpret these return codes.
Unix System Services
For the SYSCALL environment (callable services):
-3 usually means that syscalls('ON') has not been issued or did not succeed
-20 indicates that the command was not recognized
-2n indicates that the nth parameter was invalid
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