BSD 4_4_Lite1 release

[unix-history] / usr / src / usr.bin / systat / systat.1

diff --git a/usr/src/usr.bin/systat/systat.1 b/usr/src/usr.bin/systat/systat.1
index 0bf2980..3b9a5d9 100644 (file)
--- a/usr/src/usr.bin/systat/systat.1
+++ b/usr/src/usr.bin/systat/systat.1
@@ -1,146 +1,216 @@
-.\" Copyright (c) 1985 Regents of the University of California.
-.\" All rights reserved.  The Berkeley software License Agreement
-.\" specifies the terms and conditions for redistribution.
+.\" Copyright (c) 1985, 1990, 1993
+.\"    The Regents of the University of California.  All rights reserved.

 .\"
 .\"

-.\"    @(#)systat.1    6.4 (Berkeley) %G%
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"    This product includes software developed by the University of
+.\"    California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.

 .\"
 .\"

-.TH SYSTAT 1 ""
-.UC 6
-.SH NAME
-systat \- display system statistics on a crt
-.SH SYNOPSIS
-.B systat
-[
-.RI \- display
-] [
-refresh-interval
-]
-.SH DESCRIPTION
-.B Systat
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"    @(#)systat.1    8.2 (Berkeley) 12/30/93
+.\"
+.Dd December 30, 1993
+.Dt SYSTAT 1
+.Os BSD 4.3
+.Sh NAME
+.Nm systat
+.Nd display system statistics on a crt
+.Sh SYNOPSIS
+.Nm systat
+.Op Fl display
+.Op Ar refresh-interval
+.Sh DESCRIPTION
+.Nm Systat

 displays various system statistics in a screen oriented fashion
 displays various system statistics in a screen oriented fashion

-using the curses screen display library, 
-.IR curses (3X).
-.PP
+using the curses screen display library,
+.Xr curses 3 .
+.Pp

 While
 While

-.I systat
+.Nm systat

 is running the screen is usually divided into two windows (an exception
 is the vmstat display which uses the entire screen).  The
 upper window depicts the current system load average.  The
 information displayed in the lower window may vary, depending on
 user commands.  The last line on the screen is reserved for user
 input and error messages.
 is running the screen is usually divided into two windows (an exception
 is the vmstat display which uses the entire screen).  The
 upper window depicts the current system load average.  The
 information displayed in the lower window may vary, depending on
 user commands.  The last line on the screen is reserved for user
 input and error messages.

-.PP
+.Pp

 By default
 By default

-.I systat
+.Nm systat

 displays the processes getting the largest percentage of the processor
 displays the processes getting the largest percentage of the processor

-in the lower window.  Other displays show swap space usage, disk i/o
+in the lower window.  Other displays show swap space usage, disk
+.Tn I/O

 statistics (a la
 statistics (a la

-.IR iostat (1)),
+.Xr iostat  1  ) ,

 virtual memory statistics (a la
 virtual memory statistics (a la

-.IR vmstat (1)),
+.Xr vmstat  1  ) ,

 network ``mbuf'' utilization, and network connections (a la
 network ``mbuf'' utilization, and network connections (a la

-.IR netstat (1)).
-.PP
-Input is interpreted at two different levels. 
+.Xr netstat  1  ) .
+.Pp
+Input is interpreted at two different levels.

 A ``global'' command interpreter processes all keyboard input.
 If this command interpreter fails to recognize a command, the
 input line is passed to a per-display command interpreter.  This
 allows each display to have certain display-specific commands.
 A ``global'' command interpreter processes all keyboard input.
 If this command interpreter fails to recognize a command, the
 input line is passed to a per-display command interpreter.  This
 allows each display to have certain display-specific commands.

-.PP
-Certain characters cause immediate action by 
-.IR systat .
+.Pp
+Command line options:
+.Bl -tag -width "refresh_interval"
+.It Fl Ns Ar display
+The
+.Fl
+flag expects
+.Ar display
+to be one of:
+.Ic pigs ,
+.Ic iostat ,
+.Ic swap ,
+.Ic mbufs ,
+.Ic vmstat
+or
+.Ic netstat .
+These displays can also be requested interactively (without the
+.Dq Fl )
+and are described in
+full detail below.
+.It Ar refresh-interval
+The
+.Ar refresh-value
+specifies the screen refresh time interval in seconds.
+.El
+.Pp
+Certain characters cause immediate action by
+.Nm systat  .

 These are
 These are

-.IP ^L
+.Bl -tag -width Fl
+.It Ic \&^L

 Refresh the screen.
 Refresh the screen.

-.IP ^G
+.It Ic \&^G

 Print the name of the current ``display'' being shown in
 the lower window and the refresh interval.
 Print the name of the current ``display'' being shown in
 the lower window and the refresh interval.

-.IP ^Z
-Stop 
-.IR systat .
-.IP :
+.It Ic \&^Z
+Stop
+.Nm systat  .
+.It Ic \&:

 Move the cursor to the command line and interpret the input
 line typed as a command.  While entering a command the
 current character erase, word erase, and line kill characters
 may be used.
 Move the cursor to the command line and interpret the input
 line typed as a command.  While entering a command the
 current character erase, word erase, and line kill characters
 may be used.

-.PP
+.El
+.Pp

 The following commands are interpreted by the ``global''
 command interpreter.
 The following commands are interpreted by the ``global''
 command interpreter.

-.IP help
-.br
+.Bl -tag -width Fl
+.It Ic help

 Print the names of the available displays on the command line.
 Print the names of the available displays on the command line.

-.IP load
-.br
+.It Ic load

 Print the load average over the past 1, 5, and 15 minutes
 on the command line.
 Print the load average over the past 1, 5, and 15 minutes
 on the command line.

-.IP stop
-.br
+.It Ic stop

 Stop refreshing the screen.
 Stop refreshing the screen.

-.IP "[ start ] [ number ]"
-.br
+.It Xo
+.Op Ic start
+.Op Ar number
+.Xc

 Start (continue) refreshing the screen.  If a second, numeric,
 argument is provided it is interpreted as a refresh interval
 (in seconds).
 Supplying only a number will set the refresh interval to this
 value.
 Start (continue) refreshing the screen.  If a second, numeric,
 argument is provided it is interpreted as a refresh interval
 (in seconds).
 Supplying only a number will set the refresh interval to this
 value.

-.IP "quit"
-.br
-Exit 
-.IR systat .
+.It Ic quit
+Exit
+.Nm systat  .

 (This may be abbreviated to
 (This may be abbreviated to

-.IR q ).
-.PP
+.Ic q  . )
+.El
+.Pp

 The available displays are:
 The available displays are:

-.IP pigs
-.br
+.Bl -tag -width Ic
+.It Ic pigs

 Display, in the lower window, those processes resident in main
 memory and getting the
 Display, in the lower window, those processes resident in main
 memory and getting the

-largest portion of the processor (the default display). 
+largest portion of the processor (the default display).

 When less than 100% of the
 processor is scheduled to user processes, the remaining time
 is accounted to the ``idle'' process.
 When less than 100% of the
 processor is scheduled to user processes, the remaining time
 is accounted to the ``idle'' process.

-.IP iostat
-.br
+.It Ic iostat

 Display, in the lower window, statistics about processor use
 and disk throughput.  Statistics on processor use appear as
 bar graphs of the amount of time executing in user mode (``user''),
 Display, in the lower window, statistics about processor use
 and disk throughput.  Statistics on processor use appear as
 bar graphs of the amount of time executing in user mode (``user''),

-in user mode running low priority processes (``nice''), in 
+in user mode running low priority processes (``nice''), in

 system mode (``system''), and idle (``idle'').  Statistics
 on disk throughput show, for each drive, kilobytes of data transferred,
 system mode (``system''), and idle (``idle'').  Statistics
 on disk throughput show, for each drive, kilobytes of data transferred,

-number disk transaction performed, and average seek time
+number of disk transactions performed, and average seek time

 (in milliseconds).  This information may be displayed as
 bar graphs or as rows of numbers which scroll downward.  Bar
 (in milliseconds).  This information may be displayed as
 bar graphs or as rows of numbers which scroll downward.  Bar

-graphs are shown by default; commands specific to this display  
-are discussed below.
-.IP swap
-.br
-Display, in the lower window, swap space in use on each swap
-device configured.  Two sets of bar graphs are shown.  The
-upper graph displays swap space allocated to pure text segments
-(code), the lower graph displays space allocated to stack and
-data segments.  Allocated space is sorted by its size into buckets
-of size dmmin, dmmin*2, dmmin*4, up to dmmax (to reflect allocation
-policies imposed by the system).  The disk segment size, in sectors,
-is displayed along the left hand side of the text,
-and data and stack graphs.
-Space allocated to the user structure and page
-tables is not currently accounted for.
-.IP mbufs
-.br
+graphs are shown by default;
+.Pp
+The following commands are specific to the
+.Ic iostat
+display; the minimum unambiguous prefix may be supplied.
+.Pp
+.Bl -tag -width Fl -compact
+.It Cm numbers
+Show the disk
+.Tn I/O 
+statistics in numeric form.  Values are
+displayed in numeric columns which scroll downward.
+.It Cm bars
+Show the disk
+.Tn I/O
+statistics in bar graph form (default).
+.It Cm msps
+Toggle the display of average seek time (the default is to
+not display seek times).
+.El
+.It Ic swap
+Show information about swap space usage on all the 
+swap areas compiled into the kernel.
+The first column is the device name of the partition.
+The next column is the total space available in the partition.
+The 
+.Ar Used
+column indicates the total blocks used so far;
+the graph shows the percentage of space in use on each partition.
+If there are more than one swap partition in use,
+a total line is also shown.
+Areas known to the kernel, but not in use are shown as not available.
+.It Ic mbufs

 Display, in the lower window, the number of mbufs allocated
 for particular uses, i.e. data, socket structures, etc.
 Display, in the lower window, the number of mbufs allocated
 for particular uses, i.e. data, socket structures, etc.

-.IP vmstat
-.br
+.It Ic vmstat

 Take over the entire display and show a (rather crowded) compendium
 of statistics related to virtual memory usage, process scheduling,
 Take over the entire display and show a (rather crowded) compendium
 of statistics related to virtual memory usage, process scheduling,

-device interrupts, system name translation cacheing, disk i/o, etc.
-.IP
+device interrupts, system name translation cacheing, disk
+.Tn I/O
+etc.
+.Pp

 The upper left quadrant of the screen shows the number
 of users logged in and the load average over the last one, five,
 The upper left quadrant of the screen shows the number
 of users logged in and the load average over the last one, five,

-and fifteen minute interval.
+and fifteen minute intervals.

 Below this line are statistics on memory utilization.
 The first row of the table reports memory usage only among
 Below this line are statistics on memory utilization.
 The first row of the table reports memory usage only among

-active process, that is process that have run in the previous 
+active processes, that is processes that have run in the previous

 twenty seconds.
 The second row reports on memory usage of all processes.
 The first column reports on the number of physical pages
 twenty seconds.
 The second row reports on memory usage of all processes.
 The first column reports on the number of physical pages


@@ -152,31 +222,31 @@ virtual pages, that is the number of pages that would be
 needed if all processes had all of their pages.
 Finally the last column shows the number of physical pages
 on the free list.
 needed if all processes had all of their pages.
 Finally the last column shows the number of physical pages
 on the free list.

-.IP
+.Pp

 Below the memory display is the disk usage display.
 It reports the number of seeks, transfers, and number
 of kilobyte blocks transferred per second averaged over the
 refresh period of the display (by default, five seconds).
 Below the memory display is the disk usage display.
 It reports the number of seeks, transfers, and number
 of kilobyte blocks transferred per second averaged over the
 refresh period of the display (by default, five seconds).

-For some disks it also reports the average millisecond per seek.
+For some disks it also reports the average milliseconds per seek.

 Note that the system only keeps statistics on at most four disks.
 Note that the system only keeps statistics on at most four disks.

-.IP
+.Pp

 Below the disk display is a list of the
 average number of processes (over the last refresh interval)
 Below the disk display is a list of the
 average number of processes (over the last refresh interval)

-that are runable (`r'), in page wait (`p'),
+that are runnable (`r'), in page wait (`p'),

 in disk wait other than paging (`d'),
 sleeping (`s'), and swapped out but desiring to run (`w').
 Below the queue length listing is a numerical listing and
 a bar graph showing the amount of
 system (shown as `='), user (shown as `>'),
 nice (shown as `-'), and idle time (shown as ` ').
 in disk wait other than paging (`d'),
 sleeping (`s'), and swapped out but desiring to run (`w').
 Below the queue length listing is a numerical listing and
 a bar graph showing the amount of
 system (shown as `='), user (shown as `>'),
 nice (shown as `-'), and idle time (shown as ` ').

-.IP
+.Pp

 At the bottom left are statistics on name translations.
 At the bottom left are statistics on name translations.

-It lists the number names translated in the previous interval,
+It lists the number of names translated in the previous interval,

 the number and percentage of the translations that were
 handled by the system wide name translation cache, and
 the number and percentage of the translations that were
 handled by the per process name translation cache.
 the number and percentage of the translations that were
 handled by the system wide name translation cache, and
 the number and percentage of the translations that were
 handled by the per process name translation cache.

-.IP
+.Pp

 Under the date in the upper right hand quadrant are statistics
 on paging and swapping activity.
 The first two columns report the average number of pages
 Under the date in the upper right hand quadrant are statistics
 on paging and swapping activity.
 The first two columns report the average number of pages


@@ -189,175 +259,165 @@ The first row of the display shows the average
 number of disk transfers per second over the last refresh interval;
 the second row of the display shows the average
 number of pages transferred per second over the last refresh interval.
 number of disk transfers per second over the last refresh interval;
 the second row of the display shows the average
 number of pages transferred per second over the last refresh interval.

-.IP
+.Pp

 Below the paging statistics is a line listing the average number of
 total reclaims ('Rec'),
 intransit blocking page faults (`It'),
 swap text pages found in free list (`F/S'),
 file system text pages found in free list (`F/F'),
 Below the paging statistics is a line listing the average number of
 total reclaims ('Rec'),
 intransit blocking page faults (`It'),
 swap text pages found in free list (`F/S'),
 file system text pages found in free list (`F/F'),

-reclaims from free list (`RFL'),
+reclaims from free list

 pages freed by the clock daemon (`Fre'),
 pages freed by the clock daemon (`Fre'),

-and sequential process pages freed (`SFr') 
+and sequential process pages freed (`SFr')

 per second over the refresh interval.
 per second over the refresh interval.

-.IP
+.Pp

 Below this line are statistics on the average number of
 zero filled pages (`zf') and demand filled text pages (`xf')
 per second over the refresh period.
 The first row indicates the number of requests that were
 resolved, the second row shows the number that were set up,
 Below this line are statistics on the average number of
 zero filled pages (`zf') and demand filled text pages (`xf')
 per second over the refresh period.
 The first row indicates the number of requests that were
 resolved, the second row shows the number that were set up,

-and the last row shows the percentage of setup requests were
+and the last row shows the percentage of setup requests that were

 actually used.
 Note that this percentage is usually less than 100%,
 however it may exceed 100% if a large number of requests
 are actually used long after they were set up during a
 actually used.
 Note that this percentage is usually less than 100%,
 however it may exceed 100% if a large number of requests
 are actually used long after they were set up during a

-period when no new pages are being set up. 
+period when no new pages are being set up.

 Thus this figure is most interesting when observed over
 a long time period, such as from boot time
 (see below on getting such a display).
 Thus this figure is most interesting when observed over
 a long time period, such as from boot time
 (see below on getting such a display).

-.IP
+.Pp

 Below the page fill statistics is a column that
 lists the average number of context switches (`Csw'),
 Below the page fill statistics is a column that
 lists the average number of context switches (`Csw'),

-traps (`Trp'), system calls (`Sys'), interrupts (`Int'),
-characters output to DZ ports using pseudo-DMA (`Pdm'),
+traps (`Trp'; includes page faults), system calls (`Sys'), interrupts (`Int'),
+characters output to DZ ports using
+.No pseudo Ns -DMA
+(`Pdm'),
+network software interrupts (`Sof'),

 page faults (`Flt'), pages scanned by the page daemon (`Scn'),
 and revolutions of the page daemon's hand (`Rev')
 per second over the refresh interval.
 page faults (`Flt'), pages scanned by the page daemon (`Scn'),
 and revolutions of the page daemon's hand (`Rev')
 per second over the refresh interval.

-.IP
+.Pp

 Running down the right hand side of the display is a breakdown
 of the interrupts being handled by the system.
 At the top of the list is the total interrupts per second
 over the time interval.
 The rest of the column breaks down the total on a device
 Running down the right hand side of the display is a breakdown
 of the interrupts being handled by the system.
 At the top of the list is the total interrupts per second
 over the time interval.
 The rest of the column breaks down the total on a device

-by device basis. 
+by device basis.

 Only devices that have interrupted at least once since boot time are shown.
 Only devices that have interrupted at least once since boot time are shown.

-.IP netstat
-.br
-Display, in the lower window, network connections.  By default,
-network servers awaiting requests are not displayed.  Each address
-is displayed in the format ``host.port'', with each shown symbolically,
-when possible.  It is possible to have addresses displayed numerically,
-limit the display to a set of ports, hosts, and/or protocols; see the
-list of commands below.
-.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 
-.I 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 specific to the 
-.I iostat
-display; the minimum unambiguous prefix may be supplied.
-.IP numbers
-Show the disk i/o statistics in numeric form.  Values are
-displayed in numeric columns which scroll downward.
-.IP bars
-Show the disk i/o statistics in bar graph form (default).
-.IP msps
-Toggle the display of average seek time (the default is to
-not display seek times).
-.PP
+.Pp

 The following commands are specific to the
 The following commands are specific to the

-.I vmstat
+.Ic vmstat

 display; the minimum unambiguous prefix may be supplied.
 display; the minimum unambiguous prefix may be supplied.

-.IP boot
-Display cummulative statistics since the system was booted.
-.IP run
+.Pp
+.Bl -tag -width Ar -compact
+.It Cm boot
+Display cumulative statistics since the system was booted.
+.It Cm run

 Display statistics as a running total from the point this
 command is given.
 Display statistics as a running total from the point this
 command is given.

-.IP time
+.It Cm time

 Display statistics averaged over the refresh interval (the default).
 Display statistics averaged over the refresh interval (the default).

-.IP zero
+.It Cm zero

 Reset running statistics to zero.
 Reset running statistics to zero.

-.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.
-.IP "ignore [ drives ]"
-Do not display information about the drives indicated.  Multiple
-drives may be specified, separated by spaces.
-.IP "display [ drives ]"
-Display information about the drives indicated.  Multiple drives
-may be specified, separated by spaces.
-.PP
-The following command is specific to the
-.I netstat
-display; the minimum unambiguous prefix may be supplied.
-.IP all
+.El
+.It Ic netstat
+Display, in the lower window, network connections.  By default,
+network servers awaiting requests are not displayed.  Each address
+is displayed in the format ``host.port'', with each shown symbolically,
+when possible.  It is possible to have addresses displayed numerically,
+limit the display to a set of ports, hosts, and/or protocols
+(the minimum unambiguous prefix may be supplied):
+.Pp
+.Bl -tag -width Ar -compact
+.It Cm all

 Toggle the displaying of server processes awaiting requests (this
 Toggle the displaying of server processes awaiting requests (this

-is the equivalent of the 
-.B \-a
+is the equivalent of the
+.Fl a

 flag to
 flag to

-.IR netstat (1)).
-.IP numbers
+.Ar netstat  1  ) .
+.It Cm numbers

 Display network addresses numerically.
 Display network addresses numerically.

-.IP names
+.It Cm names

 Display network addresses symbolically.
 Display network addresses symbolically.

-.PP
-The remaining commands are common to displays which report
-network connections (currently only the
-.I netstat
-display).   These commands may be used to select a specific set
-of connections for
-.I systat
-to report on.
-.IP "\fIprotocol\fP"
+.It Ar protocol

 Display only network connections using the indicated protocol
 (currently either ``tcp'' or ``udp'').
 Display only network connections using the indicated protocol
 (currently either ``tcp'' or ``udp'').

-.IP "ignore [items]"
+.It Cm ignore Op Ar items

 Do not display information about connections associated with
 the specified hosts or ports.  Hosts and ports may be specified
 Do not display information about connections associated with
 the specified hosts or ports.  Hosts and ports may be specified

-by name (``ucbmonet'', ``ftp''), or numerically.  Host addresses
+by name (``vangogh'', ``ftp''), or numerically.  Host addresses

 use the Internet dot notation (``128.32.0.9'').  Multiple items
 may be specified with a single command by separating them with
 spaces.
 use the Internet dot notation (``128.32.0.9'').  Multiple items
 may be specified with a single command by separating them with
 spaces.

-.IP "display [items]"
+.It Cm display Op Ar items

 Display information about the connections associated with the
 Display information about the connections associated with the

-specified hosts or ports.  As for 
-.IR ignore ,
-items may be names or numbers.
-.IP "show [ports|hosts]"
+specified hosts or ports.  As for
+.Ar ignore  ,
+.Op Ar items
+may be names or numbers.
+.It Cm show Op Ar ports\&|hosts

 Show, on the command line, the currently selected protocols,
 hosts, and ports.  Hosts and ports which are being ignored
 are prefixed with a `!'.  If
 Show, on the command line, the currently selected protocols,
 hosts, and ports.  Hosts and ports which are being ignored
 are prefixed with a `!'.  If

-.I ports
+.Ar ports

 or
 or

-.I hosts
-are supplied as an argument to 
-.IR show ,
-then only the request information will be displayed.
-.IP "reset"
+.Ar hosts
+is supplied as an argument to
+.Cm show  ,
+then only the requested information will be displayed.
+.It Cm reset

 Reset the port, host, and protocol matching mechanisms to the default
 (any protocol, port, or host).
 Reset the port, host, and protocol matching mechanisms to the default
 (any protocol, port, or host).

-.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

 display looks out of place because it is (it was added in as
 display looks out of place because it is (it was added in as

-a separate display rather than create a new program). 
-.PP
-The whole
-thing is pretty hoakey, it was included in the distribution under
-serious duress.
+a separate display rather than created as a new program).