+.It Fl W Ns Ar err...
+Print warning messages. If set to
+.Fl W Ns Ar all ,
+all warnings are printed; if
+.Fl W Ns Ar error ,
+warnings are considered errors and cause utility termination. Multiple
+.Fl W
+arguments may be comma-separated, such as
+.Fl W Ns Ar error,all .
+.It Fl v
+Make warning and error messages verbose.