nextcloud-desktop/doc/options.rst

When invoking the client from the command line, the following options are supported:

-h, --help

Displays all command options.

--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.