-- * `0` or `false` - Disables the target. * `1` or `true` - Writes to `STDERR`. * `[2-9]` - Writes to the already opened file descriptor. * `` - Writes to the file in append mode. * `af_unix:[:]` - Write to a Unix DomainSocket (on platforms that support them). Socket type can be either `stream` or `dgram`; if omitted Git will try both. --