diff --git a/libexec/revnetgroup/hash.c b/libexec/revnetgroup/hash.c
index b8758439e9e4..1469fcf7aab4 100644
--- a/libexec/revnetgroup/hash.c
+++ b/libexec/revnetgroup/hash.c
@@ -29,7 +29,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id$
+ *	$Id: hash.c,v 1.1.1.1 1995/10/26 16:25:29 wpaul Exp $
  */
 
 #include <stdio.h>
@@ -38,6 +38,10 @@
 #include <sys/types.h>
 #include "hash.h"
 
+#ifndef lint
+static const char rcsid[] = "$Id$";
+#endif
+
 /*
  * This hash function is stolen directly from the
  * Berkeley DB package. It already exists inside libc, but
@@ -97,7 +101,7 @@ hash(keyarg, len)
 /*
  * Generate a hash value for a given key (character string).
  * We mask off all but the lower 8 bits since our table array
- * can only hole 256 elements.
+ * can only hold 256 elements.
  */
 u_int32_t hashkey(key)
 	char *key;
@@ -136,7 +140,7 @@ char *lookup(table, key)
  *
  * One way to deal with this is to malloc(2) a second table and start
  * doing indirection, but this is a pain in the butt and it's not worth
- * going to all that trouble for a dinky littke program like this. Instead,
+ * going to all that trouble for a dinky little program like this. Instead,
  * we turn each table entry into a linked list and simply link keys
  * with the same hash value together at the same index location within
  * the table.
@@ -162,7 +166,7 @@ void store (table, key, data)
 }
 
 /*
- * Store an group member entry and/or update its grouplist. This is
+ * Store a group member entry and/or update its grouplist. This is
  * a bit more complicated than the previous function since we have to
  * maintain not only the hash table of group members, each group member
  * structure also has a linked list of groups hung off it. If handed
diff --git a/libexec/revnetgroup/hash.h b/libexec/revnetgroup/hash.h
index 2212534ff3c9..4de29e659867 100644
--- a/libexec/revnetgroup/hash.h
+++ b/libexec/revnetgroup/hash.h
@@ -29,7 +29,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id$
+ *	$Id: hash.h,v 1.1.1.1 1995/10/26 16:25:29 wpaul Exp $
  */
 
 /* Groupname entry hung off a member_entry node. */
@@ -50,7 +50,6 @@ struct member_entry {
 struct group_entry {
 	char *key;
 	char *data;
-	struct grps *groups;
 	struct group_entry *next;
 };
 
diff --git a/libexec/revnetgroup/parse_netgroup.c b/libexec/revnetgroup/parse_netgroup.c
index 99dfaeb37b61..bc048e12eaed 100644
--- a/libexec/revnetgroup/parse_netgroup.c
+++ b/libexec/revnetgroup/parse_netgroup.c
@@ -35,7 +35,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "$Id$";
+static char sccsid[] = "$Id: parse_netgroup.c,v 1.1.1.1 1995/10/26 16:25:29 wpaul Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 /*
@@ -51,6 +51,10 @@ static char sccsid[] = "$Id$";
 #include <unistd.h>
 #include "hash.h"
 
+#ifndef lint
+static const char rcsid[] = "$Id$";
+#endif
+
 /*
  * Static Variables and functions used by setnetgrent(), getnetgrent() and
  * __endnetgrent().
diff --git a/libexec/revnetgroup/revnetgroup.c b/libexec/revnetgroup/revnetgroup.c
index 4a3ab5aac7c5..e92f3c063a72 100644
--- a/libexec/revnetgroup/revnetgroup.c
+++ b/libexec/revnetgroup/revnetgroup.c
@@ -35,7 +35,7 @@
  * Center for Telecommunications Research
  * Columbia University, New York City
  *
- *	$Id$
+ *	$Id: revnetgroup.c,v 1.1.1.1 1995/10/26 16:25:29 wpaul Exp $
  */
 
 #include <stdio.h>
@@ -43,6 +43,10 @@
 #include <string.h>
 #include "hash.h"
 
+#ifndef lint
+static const char rcsid[] = "$Id$";
+#endif
+
 #define LINSIZ 1024
 
 /* Default location of netgroup file. */
@@ -71,17 +75,17 @@ char *prog;
 extern char *optarg;
 
 main(argc, argv)
-int argc;
-char *argv[0];
+	int argc;
+	char *argv[];
 {
 	FILE *fp;
 	char readbuf[LINSIZ];
 	struct group_entry *gcur;
 	struct member_entry *mcur;
 	char *host, *user, *domain;
-	char ch;
+	int ch;
 	char *key = NULL, *data = NULL;
-	int hosts, i;
+	int hosts = -1, i;
 
 	if (argc < 2)
 		usage(argv[0]);
@@ -89,9 +93,17 @@ char *argv[0];
 	while ((ch = getopt(argc, argv, "uhf:")) != EOF) {
 		switch(ch) {
 		case 'u':
+			if (hosts != -1) {
+				warnx("please use only one of -u or -h");
+				usage(argv[0]);
+			}
 			hosts = 0;
 			break;
 		case 'h':
+			if (hosts != -1) {
+				warnx("please use only one of -u or -h");
+				usage(argv[0]);
+			}
 			hosts = 1;
 			break;
 		case 'f':
@@ -103,6 +115,9 @@ char *argv[0];
 		}
 	}
 
+	if (hosts == -1)
+		usage(argv[0]);
+
 	if (strcmp(netgroup, "-")) {
 		if ((fp = fopen(netgroup, "r")) == NULL) {
 			perror(netgroup);