-.SH FILES
-.nf
-.ta \w'/dev/services 'u
-/vmunix for the namelist
-/dev/kmem for information in main memory
-/dev/drum for information about swapped out processes
-/etc/hosts for host names
-/etc/networks for network names
-/etc/services for port names
-.SH AUTHOR
-The unknown hacker. The
-.I pigs
-display is derived from a program of the same name
-written by Bill Reeves.
-.SH BUGS
-Takes 2-10 percent of the cpu. Certain displays presume
-a 24 line by 80 character terminal. The swap space display
-should account for space allocated to the user structure and
-page tables. The
-.I vmstat
+.El
+.El
+.Pp
+Commands to switch between displays may be abbreviated to the
+minimum unambiguous prefix; for example, ``io'' for ``iostat''.
+Certain information may be discarded when the screen size is
+insufficient for display. For example, on a machine with 10
+drives the
+.Ic iostat
+bar graph displays only 3 drives on a 24 line terminal. When
+a bar graph would overflow the allotted screen space it is
+truncated and the actual value is printed ``over top'' of the bar.
+.Pp
+The following commands are common to each display which shows
+information about disk drives. These commands are used to
+select a set of drives to report on, should your system have
+more drives configured than can normally be displayed on the
+screen.
+.Pp
+.Bl -tag -width Tx -compact
+.It Cm ignore Op Ar drives
+Do not display information about the drives indicated. Multiple
+drives may be specified, separated by spaces.
+.It Cm display Op Ar drives
+Display information about the drives indicated. Multiple drives
+may be specified, separated by spaces.
+.El
+.Sh FILES
+.Bl -tag -width /etc/networks -compact
+.It Pa /vmunix
+For the namelist.
+.It Pa /dev/kmem
+For information in main memory.
+.It Pa /dev/drum
+For information about swapped out processes.
+.It Pa /etc/hosts
+For host names.
+.It Pa /etc/networks
+For network names.
+.It Pa /etc/services
+For port names.
+.El
+.Sh HISTORY
+The
+.Nm systat
+program appeared in
+.Bx 4.3 .
+.Sh BUGS
+Takes 2-10 percent of the cpu.
+Certain displays presume a minimum of 80 characters per line.
+The
+.Ic vmstat