Commodore PC 20 - Page 219

Upon completion, replace returns one of the following exit
codes:
0 Command successful
1 Command line error
2 File not found
3
Path not found
5
Access denied
8
Insufficient memory
15
Invalid drive
Other Standard MS-DOS error
You can test for these codes by using the enurlevel condition of
the batch processing if command.
MS-DOS Commands 81 I
Replace exit codes