The manual page of df called cd9660 file systems by the name

isofs while the df command itself used the name iso9660fs or
        cdfs. Both of these were inconsistent with the name cd9660 which
        is used by the mount command. I modified df to recognize all of
        the names cd9660, cdfs, isofs, and iso9660fs, and take them all
        to refer to the same thing. Naturally I added a note of this
        behaviour in the manual page too.

Submitted-By: Jukka Ukkonen <jau@jau.csc.fi>

bin/df/df.c

@@ -35,7 +35,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: df.c,v 1.7 1995/05/30 00:06:42 rgrimes Exp $
+ *	$Id: df.c,v 1.8 1996/01/14 18:55:09 bde Exp $
  */
 
 #ifndef lint
@@ -95,6 +95,8 @@ struct typetab {
 	{"procfs",	MT(MOUNT_PROCFS)},
 	{"afs",		MT(MOUNT_AFS)},
 	{"iso9660fs",	MT(MOUNT_CD9660)},
+	{"isofs",	MT(MOUNT_CD9660)},
+	{"cd9660",	MT(MOUNT_CD9660)},
 	{"cdfs",	MT(MOUNT_CD9660)},
 	{"misc",	MT(MOUNT_LOFS)|MT(MOUNT_FDESC)|MT(MOUNT_PORTAL)|
 			MT(MOUNT_KERNFS)|MT(MOUNT_PROCFS)},