| Value | Meaning |
|---|---|
| success0 | Success. |
| exception1 | An unhandled exception was thrown. |
| failedToFetchList2 | The JSON list of images could not be fetched from server. |
| imageJSONNotFound3 | The JSON list file could not be found. |
| targetDirNotADir4 | Target directory is a file or other non-directory. |
Shell return values.