|  | -- | 
|  | * `0` or `false` - Disables the target. | 
|  | * `1` or `true` - Writes to `STDERR`. | 
|  | * `[2-9]` - Writes to the already opened file descriptor. | 
|  | * `<absolute-pathname>` - Writes to the file in append mode. If the target | 
|  | already exists and is a directory, the traces will be written to files (one | 
|  | per process) underneath the given directory. | 
|  | * `af_unix:[<socket-type>:]<absolute-pathname>` - Write to a | 
|  | Unix DomainSocket (on platforms that support them).  Socket | 
|  | type can be either `stream` or `dgram`; if omitted Git will | 
|  | try both. | 
|  | -- |