--- loncom/debugging_tools/excise_from_db.pl	2004/01/27 18:42:25	1.1
+++ loncom/debugging_tools/excise_from_db.pl	2005/03/19 00:39:54	1.2
@@ -4,7 +4,7 @@
 #
 # excise_from_db.pl - Remove a key from a db file.
 #
-# $Id: excise_from_db.pl,v 1.1 2004/01/27 18:42:25 matthew Exp $
+# $Id: excise_from_db.pl,v 1.2 2005/03/19 00:39:54 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -37,6 +37,12 @@ use GDBM_File;
 my $fname = shift;
 my $key = shift;
 
+if (! defined($fname) || ! defined($key)) {
+    print "Specify db file and key on command line.".$/.
+        'excise_from_db.pl roles.db "a very long key"'.$/;
+    exit;
+}
+
 my %db;
 if (! tie(%db,'GDBM_File',$fname,&GDBM_WRITER,0640)) {
     warn "Unable to tie to $fname";