RC.
ARexx commands return the following codes:
| 0 | Command executed successfully. |
|---|---|
| 1 | Command executed successfully, but there is some condition that might be of interest. |
| 5 | The command was syntactically valid, but could not be completed for some reason. |
| 10 | You supplied invalid arguments for this command. |
| 11 | You submitted an unknown command. |
| 20 | There was an internal error. The command is not executed. |