.BI -m mntpt
]
[
+.B -r
+]
+[
.I keyfile
]
.PP
.IR keyfile ,
a new version of the file is written.
.PP
+If the
+.B -r
+option is given, the database is mounted `read-only' and no changes are permitted.
+.PP
There are two authentication databases,
one for Plan 9 user information,
and one for SecureNet user information.