You have the option of starting your ownCloud desktop client with the owncloud command. The following options are supported:

owncloud -h or owncloud --help
Displays all command options.

The other options are:

--logwindow
Opens a window displaying log output.
--logfile <filename>
Write log output to the file specified. To write to stdout, specify - as the filename.
--logdir <name>
Writes each synchronization log output in a new file in the specified directory.
--logexpire <hours>
Removes logs older than the value specified (in hours). This command is used with --logdir.
--logflush
Clears (flushes) the log file after each write action.
--confdir <dirname>
Uses the specified configuration directory.