+The options are as follows:
+.Bl -tag -width ".Ar username"
+.It Fl f Ar file
+The
+.Nm
+utility will get a list of users to be removed from
+.Ar file ,
+which will contain one user per line.
+Anything following a hash mark
+.Pq Ql # ,
+including the hash mark itself, is considered a comment and will not
+be processed.
+If the file is owned by anyone other than a user with
+UID 0, or is writable by anyone other than the owner,
+.Nm
+will refuse to continue.