diff --git a/lib/libc/db/man/mpool.3 b/lib/libc/db/man/mpool.3
index 32673f90f2f6..14814b9a682e 100644
--- a/lib/libc/db/man/mpool.3
+++ b/lib/libc/db/man/mpool.3
@@ -1,4 +1,4 @@
-.\"	$NetBSD: mpool.3,v 1.10 2010/12/16 11:49:35 jruoho Exp $
+.\"	$NetBSD: mpool.3,v 1.11 2019/03/08 08:35:58 msaitoh Exp $
 .\"
 .\" Copyright (c) 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -116,7 +116,7 @@ If the
 .Fa pgout
 function is specified, it is called each time a buffer is written into
 the backing file.
-Both functions are are called with the
+Both functions are called with the
 .Fa pgcookie
 pointer, the page number and a pointer to the page to being read or
 written.
diff --git a/sys/arch/mips/atheros/dev/if_ae.c b/sys/arch/mips/atheros/dev/if_ae.c
index 3ba9a26cfe8a..999b1d15e11d 100644
--- a/sys/arch/mips/atheros/dev/if_ae.c
+++ b/sys/arch/mips/atheros/dev/if_ae.c
@@ -1,4 +1,4 @@
-/* $Id: if_ae.c,v 1.32 2019/01/22 03:42:25 msaitoh Exp $ */
+/* $Id: if_ae.c,v 1.33 2019/03/08 08:35:58 msaitoh Exp $ */
 /*-
  * Copyright (c) 2006 Urbana-Champaign Independent Media Center.
  * Copyright (c) 2006 Garrett D'Amore.
@@ -91,14 +91,14 @@
  *    for TCP/IP.  (Aligning IP headers on a word.)
  *
  * 2) There is stuff in original tulip to shut down the device when reacting
- *    to a a change in link status.  Is that needed.
+ *    to a change in link status.  Is that needed.
  *
  * 3) Test with variety of 10/100 HDX/FDX scenarios.
  *
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_ae.c,v 1.32 2019/01/22 03:42:25 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_ae.c,v 1.33 2019/03/08 08:35:58 msaitoh Exp $");
 
 
 #include <sys/param.h>
diff --git a/sys/dev/scsipi/scsi_changer.h b/sys/dev/scsipi/scsi_changer.h
index 2eb33bf36460..e29679237036 100644
--- a/sys/dev/scsipi/scsi_changer.h
+++ b/sys/dev/scsipi/scsi_changer.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: scsi_changer.h,v 1.20 2005/12/11 12:23:50 christos Exp $	*/
+/*	$NetBSD: scsi_changer.h,v 1.21 2019/03/08 08:35:58 msaitoh Exp $	*/
 
 /*
  * Copyright (c) 1996, 1999 Jason R. Thorpe <thorpej@and.com>
@@ -368,7 +368,7 @@ struct page_device_capabilities {
  * Some of these fields can be a little confusing, so an explanation
  * is in order.
  *
- * Each component within a a medium changer apparatus is called an
+ * Each component within a medium changer apparatus is called an
  * "element".
  *
  * The "medium transport element address" is the address of the first
diff --git a/sys/dev/scsipi/ses.c b/sys/dev/scsipi/ses.c
index 38c120a7d4a6..be5ad03417f4 100644
--- a/sys/dev/scsipi/ses.c
+++ b/sys/dev/scsipi/ses.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ses.c,v 1.50 2016/11/20 15:37:19 mlelstv Exp $ */
+/*	$NetBSD: ses.c,v 1.51 2019/03/08 08:35:58 msaitoh Exp $ */
 /*
  * Copyright (C) 2000 National Aeronautics & Space Administration
  * All rights reserved.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ses.c,v 1.50 2016/11/20 15:37:19 mlelstv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ses.c,v 1.51 2019/03/08 08:35:58 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_scsi.h"
@@ -552,7 +552,7 @@ ses_log(struct ses_softc *ssc, const char *fmt, ...)
 /*
  * Is this a device that supports enclosure services?
  *
- * It's a a pretty simple ruleset- if it is device type 0x0D (13), it's
+ * It's a pretty simple ruleset- if it is device type 0x0D (13), it's
  * an SES device. If it happens to be an old UNISYS SEN device, we can
  * handle that too.
  */
diff --git a/tests/fs/nfs/t_rquotad.sh b/tests/fs/nfs/t_rquotad.sh
index dc9226ce17cc..d883307a759c 100644
--- a/tests/fs/nfs/t_rquotad.sh
+++ b/tests/fs/nfs/t_rquotad.sh
@@ -1,4 +1,4 @@
-# $NetBSD: t_rquotad.sh,v 1.5 2016/08/10 23:25:39 kre Exp $ 
+# $NetBSD: t_rquotad.sh,v 1.6 2019/03/08 08:35:58 msaitoh Exp $ 
 #
 #  Copyright (c) 2011 Manuel Bouyer
 #  All rights reserved.
@@ -54,7 +54,7 @@ get_nfs_quota()
 		;;
 	esac
 
-#start a a nfs server
+#start a nfs server
 
 	atf_check -s exit:0 rump_server -lrumpvfs -lrumpdev -lrumpnet   \
 	    -lrumpnet_net -lrumpnet_netinet -lrumpnet_netinet6          \