Comprehensive list of rsync error codes [closed]
Per the rsync "man" page, here are the error codes it could return and what they mean. If you're scripting it in bash, you could look at $?
0 Success 1 Syntax or usage error 2 Protocol incompatibility 3 Errors selecting input/output files, dirs 4 Requested action not supported: an attempt was made to manipulate 64-bit files on a platform that cannot support them; or an option was specified that is supported by the client and not by the server. 5 Error starting client-server protocol 6 Daemon unable to append to log-file10 Error in socket I/O11 Error in file I/O12 Error in rsync protocol data stream13 Errors with program diagnostics14 Error in IPC code20 Received SIGUSR1 or SIGINT21 Some error returned by waitpid()22 Error allocating core memory buffers23 Partial transfer due to error24 Partial transfer due to vanished source files25 The --max-delete limit stopped deletions30 Timeout in data send/receive35 Timeout waiting for daemon connectionI've never seen a comprehensive "most common errors" list but I'm betting error code 1 would be at the top.