+.TP
+\fB \-f [\-\-force\-overwrite]\fP \fIwhat
+where what is is either "\fBall\fR", "\fBmain\fR" or "\fBnone\fR".
+Specify "\fBall\fR" to allow overwriting all files during a batch export,
+"\fBmain\fR" to allow overwriting the main file only, or "\fBnone\fR"
+to disallow overwriting any file. When this switch is followed by anything
+else other than "\fBall\fR", "\fBmain\fR" or "\fBnone\fR", the behavior is as
+if "\fBall\fR" was specified, but what follows is left on the command line for
+further processing.
+.TP
+.BI -batch
+causes LyX to run the given commands without opening a GUI window.
+Thus, something like:
+.br
+ lyx -batch -x "buffer-print printer default dvips" myfile.lyx
+.br
+will cause LyX to print myfile.lyx to the default printer, using dvips and
+the default print settings (which, of course, have to have been configured
+already).