d09131e044
Add or fix options to control static and dynamic configuration. Keep the default of scteken, but default to statically configuring all available emulators (now 3 instead of 1). The dumb emulator is almost usable. libedit and libreadline handle dumb terminals perfectly for at least shell history. less(1) works as well as possible except on exit. But curses programs make messes. The dumb emulator has strange color support, with 2 dumb colors for normal output but fancy colorization for the cursor, mouse pointer and (with a non-dumb initial emulator) for low-level console output. Using the sc emulator instead of the default of scteken fixes at least the following bugs: - NUL is a printing character in cons25 but not in teken - teken doesn't support fixed colors for "reverse" video. - The best versions of sc are about 10 times faster than scteken (for printing to the frame buffer). This version is only about 5 times faster. Fix configuration features: - make SC_DFLT_TERM (for setting the initial emulator) a normal option. Add configuration features: - negative options SC_NO_TERM_* for omitting emulators in the static config. Modules for emulators might work, but I don't know of any - vidcontrol -e shows the available emulators - vidcontrol -E <emulator> sets the active emulator.
634 lines
18 KiB
Groff
634 lines
18 KiB
Groff
.\"
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.\" Copyright (c) 1999
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.\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 2, 2018
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.Dt SYSCONS 4
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.Os
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.Sh NAME
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.Nm syscons ,
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.Nm sc
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.Nd the console driver
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.Sh SYNOPSIS
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.Cd "options MAXCONS=N"
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.Cd "options SC_ALT_MOUSE_IMAGE"
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.Cd "options SC_CUT_SEPCHARS=_characters_"
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.Cd "options SC_CUT_SPACES2TABS"
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.Cd "options SC_DFLT_TERM"
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.Cd "options SC_DISABLE_KDBKEY"
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.Cd "options SC_DISABLE_REBOOT"
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.Cd "options SC_HISTORY_SIZE=N"
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.Cd "options SC_MOUSE_CHAR=C"
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.Cd "options SC_NO_CUTPASTE"
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.Cd "options SC_NO_FONT_LOADING"
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.Cd "options SC_NO_HISTORY"
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.Cd "options SC_NO_PALETTE_LOADING"
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.Cd "options SC_NO_SUSPEND_VTYSWITCH"
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.Cd "options SC_NO_SYSMOUSE"
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.Cd "options SC_NO_TERM_DUMB"
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.Cd "options SC_NO_TERM_SC"
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.Cd "options SC_NO_TERM_SCTEKEN"
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.Cd "options SC_PIXEL_MODE"
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.Cd "options SC_TWOBUTTON_MOUSE"
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.Cd "options SC_NORM_ATTR=_attribute_"
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.Cd "options SC_NORM_REV_ATTR=_attribute_"
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.Cd "options SC_KERNEL_CONS_ATTR=_attribute_"
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.Cd "options SC_KERNEL_CONS_ATTRS=_attributes_"
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.Cd "options SC_KERNEL_CONS_REV_ATTR=_attribute_"
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.Cd "options SC_DFLT_FONT"
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.Cd "makeoptions SC_DFLT_FONT=_font_name_"
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.Cd "device sc"
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.Pp
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In
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.Pa /boot/device.hints :
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.Cd hint.sc.0.at="isa"
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.Cd hint.sc.0.vesa_mode=0x103
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.Pp
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In
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.Pa /boot/loader.conf :
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.Cd kern.vty=sc
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.Sh DESCRIPTION
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The
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.Nm
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driver provides multiple virtual terminals.
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It resembles the SCO color console driver.
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.Pp
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The
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.Nm
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driver is implemented on top of the keyboard driver
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.Pq Xr atkbd 4
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and the video card driver
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.Pq Xr vga 4
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and so requires both of them to be configured in the system.
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.Pp
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There can be only one
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.Nm
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device defined in the system.
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.Ss Virtual Terminals
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The
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.Nm
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driver provides multiple virtual terminals which appear as if they were
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separate terminals.
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One virtual terminal is considered current and exclusively
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occupies the screen and the keyboard; the other virtual terminals
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are placed in the background.
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.Pp
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In order to use virtual terminals, they must be individually
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marked ``on'' in
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.Pa /etc/ttys
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so that
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.Xr getty 8
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will recognize them to be active and run
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.Xr login 1
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to let the user log in to the system.
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By default, only the first eight virtual terminals are activated in
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.Pa /etc/ttys .
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.Pp
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You press the
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.Dv Alt
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key and a switch key to switch between
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virtual terminals.
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The following table summarizes the correspondence between the switch
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key and the virtual terminal.
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.Bd -literal -offset indent
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Alt-F1 ttyv0 Alt-F7 ttyv6 Shift-Alt-F1 ttyva
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Alt-F2 ttyv1 Alt-F8 ttyv7 Shift-Alt-F2 ttyvb
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Alt-F3 ttyv2 Alt-F9 ttyv8 Shift-Alt-F3 ttyvc
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Alt-F4 ttyv3 Alt-F10 ttyv9 Shift-Alt-F4 ttyvd
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Alt-F5 ttyv4 Alt-F11 ttyva Shift-Alt-F5 ttyve
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Alt-F6 ttyv5 Alt-F12 ttyvb Shift-Alt-F6 ttyvf
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.Ed
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.Pp
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You can also use the ``nscr'' key (usually the
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.Dv PrintScreen
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key on the AT Enhanced keyboard) to cycle available virtual terminals.
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.Pp
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The default number of available virtual terminals is 16.
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This can be changed with the kernel configuration option
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.Dv MAXCONS
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(see below).
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.Pp
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Note that the X server usually requires a virtual terminal for display
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purposes, so at least one terminal must be left unused by
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.Xr getty 8
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so that it can be used by the X server.
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.Ss Key Definitions and Function Key Strings
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The
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.Nm
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driver, in conjunction with the keyboard driver, allows the user
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to change key definitions and function key strings.
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The
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.Xr kbdcontrol 1
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command will load a key definition file (known as ``keymap'' file),
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dump the current keymap, and assign a string to a function key.
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See
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.Xr keyboard 4
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and
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.Xr kbdmap 5
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for the keymap file.
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.Pp
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You may want to set the
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.Ar keymap
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variable in
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.Pa /etc/rc.conf.local
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to the desired keymap file so that it will be automatically loaded
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when the system starts up.
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.Ss Software Font
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For most modern video cards, e.g., VGA, the
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.Nm
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driver and the video card driver allow the user to change
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the font used on the screen.
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The
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.Xr vidcontrol 1
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command can be used to load a font file from
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.Pa /usr/share/syscons/fonts .
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.Pp
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The font comes in various sizes: 8x8, 8x14 and 8x16.
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The 8x16 font is typically used for the VGA card in the
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80-column-by-25-line mode.
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Other video modes may require different font sizes.
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It is better to always load all three sizes of the same font.
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.Pp
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You may set
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.Ar font8x8 ,
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.Ar font8x14
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and
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.Ar font8x16
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variables in
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.Pa /etc/rc.conf
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to the desired font files so that they will be automatically loaded
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when the system starts up.
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.Pp
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Optionally you can specify a particular font file as the default.
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See the
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.Dv SC_DFLT_FONT
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option below.
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.Ss Screen Map
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If your video card does not support software fonts, you may still be able
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to achieve a similar effect by re-mapping the font built into your video card.
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Use
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.Xr vidcontrol 1
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to load a screen map file which defines the mapping between character codes.
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.Ss Mouse Support and Copy-and-Paste
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You can use your mouse to copy text on the screen and paste it as if
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it was typed by hand.
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You must be running the mouse daemon
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.Xr moused 8
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and enable the mouse cursor in the virtual terminal via
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.Xr vidcontrol 1 .
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.Pp
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Pressing mouse button 1 (usually the left button) will start selection.
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Releasing button 1 will end the selection process.
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The selected text will be marked by inverting foreground and
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background colors.
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You can press button 3 (usually the right button) to extend
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the selected region.
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The selected text is placed in the copy buffer and can be pasted
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at the cursor position by pressing button 2 (usually the
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middle button) as many times as you like.
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.Pp
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If your mouse has only two buttons, you may want to use the
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.Dv SC_TWOBUTTON_MOUSE
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option below to make the right button to paste the text.
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Alternatively you can make the mouse daemon
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emulate the middle button.
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See the man page for
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.Xr moused 8
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for more details.
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.Ss Back Scrolling
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The
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.Nm
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driver allows the user to browse the output which has ``scrolled off''
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the top of the screen.
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.Pp
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Press the ``slock'' key (usually
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.Dv ScrllLock
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/
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.Dv Scroll Lock
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or
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.Dv Pause
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on many keyboards) and the terminal is
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in the ``scrollback'' mode.
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It is indicated by the
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.Dv Scroll Lock
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LED.
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Use the arrow keys, the
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.Dv Page Up/Down
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keys and the
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.Dv Home/End
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|
keys to scroll buffered terminal output.
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Press the ``slock'' key again to get back to the normal terminal mode.
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.Pp
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The size of the scrollback buffer can be set by the
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.Dv SC_HISTORY_SIZE
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option described below.
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.Ss Screen Saver
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The
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.Nm
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driver can be made to put up the screen saver if the current
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virtual terminal is idle, that is, the user is not typing
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on the keyboard nor moving the mouse.
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See
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.Xr splash 4
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and
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.Xr vidcontrol 1
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for more details.
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.Sh DRIVER CONFIGURATION
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|
.Ss Kernel Configuration Options
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|
The following kernel configuration options control the
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.Nm
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driver.
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.Bl -tag -width MOUSE
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.It Dv MAXCONS=N
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This option sets the number of virtual terminals to
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.Fa N .
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The default value is 16.
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.It Dv SC_ALT_MOUSE_IMAGE
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This option selects the alternative way of displaying the mouse cursor
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in the virtual terminal.
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|
It may be expensive for some video cards to draw the arrow-shaped
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cursor, and you may want to try this option.
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|
However, the appearance of the alternative mouse cursor may not be
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very appealing.
|
|
Note that if you use the
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.Dv SC_NO_FONT_LOADING
|
|
option then you must also use this option if you wish to be able to use
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the mouse.
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.It Dv SC_CUT_SEPCHARS=_characters_
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This options specifies characters that will be looked for when the
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driver searches for words boundaries when doing cut operation.
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By default, its value is
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.Qq Li \ex20
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\(em a space character.
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.It Dv SC_CUT_SPACES2TABS
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|
This options instructs the driver to convert leading spaces into tabs
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when copying data into cut buffer.
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This might be useful to preserve
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indentation when copying tab-indented text.
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.It Dv SC_DFLT_TERM=_name_
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This option specifies the name of the preferred terminal emulator.
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.It Dv SC_DISABLE_KDBKEY
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This option disables the ``debug'' key combination (by default, it is
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.Dv Alt-Esc ,
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or
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.Dv Ctl-PrintScreen ) .
|
|
It will prevent users from
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entering the kernel debugger (KDB) by pressing the key combination.
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|
KDB will still be invoked when the kernel panics or hits a break point
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if it is included in the kernel.
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|
If this option is not defined, this behavior may be controlled at runtime
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by the
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.Xr sysctl 8
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variable
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.Va hw.syscons.kbd_debug .
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.It Dv SC_DISABLE_REBOOT
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This option disables the ``reboot'' key (by default, it is
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.Dv Ctl-Alt-Del ) ,
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so that the casual user may not accidentally reboot the system.
|
|
If this option is not defined, this behavior may be controlled at runtime
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by the
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.Xr sysctl 8
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variable
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.Va hw.syscons.kbd_reboot .
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.It Dv SC_HISTORY_SIZE=N
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Sets the size of back scroll buffer to
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.Fa N
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lines.
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The default value is 100.
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.It Dv SC_MOUSE_CHAR=C
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Unless the
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.Dv SC_ALT_MOUSE_IMAGE
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option above is specified, the
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.Nm
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driver reserves four consecutive character codes in order to display the
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mouse cursor in the virtual terminals in some systems.
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This option specifies the first character code to
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.Fa C
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to be used for this purpose.
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The default value is 0xd0.
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A good candidate is 0x03.
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.It Dv SC_PIXEL_MODE
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Adds support for pixel (raster) mode console.
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This mode is useful on some laptop computers, but less so on
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most other systems, and it adds substantial amount of code to syscons.
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If this option is NOT defined, you can reduce the kernel size a lot.
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See the
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.Dv VESAMODE
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flag below.
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.It Dv SC_TWOBUTTON_MOUSE
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If you have a two button mouse, you may want to add this option
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to use the right button of the mouse to paste text.
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See
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.Sx Mouse Support and Copy-and-Paste
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above.
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.It Dv SC_NORM_ATTR=_attribute_
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.It Dv SC_NORM_REV_ATTR=_attribute_
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.It Dv SC_KERNEL_CONS_ATTR=_attribute_
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.It Dv SC_KERNEL_CONS_ATTRS=_attributes_
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.It Dv SC_KERNEL_CONS_REV_ATTR=_attribute_
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These options will set the default colors.
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Available colors are defined in
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.In machine/pc/display.h .
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See
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.Sx EXAMPLES
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below.
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.Dv SC_KERNEL_CONS_ATTRS
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is a character string giving a sequence of attributes in binary format.
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The sequence will be repeated up to the number of CPUs.
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Beware that the string must not be null,
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since the kernel divides by its length.
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.It Dv SC_DFLT_FONT
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This option will specify the default font.
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Available fonts are: iso, iso2, koi8-r, koi8-u, cp437, cp850, cp865,
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cp866 and cp866u.
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16-line, 14-line and 8-line font data will be compiled in.
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Without this option, the
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.Nm
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driver will use whatever font is already loaded in the video card,
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unless you explicitly load a software font at startup.
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See
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.Sx EXAMPLES
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below.
|
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.It Dv SC_NO_SUSPEND_VTYSWITCH
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This option, which is also available as
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.Xr loader 8
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tunable and
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.Xr sysctl 8
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variable
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.Va hw.syscons.sc_no_suspend_vtswitch ,
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disables switching between virtual terminals (graphics <-> text) during
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suspend/resume (ACPI and APM).
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Use this option if your system is freezing
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when you are running X and trying to suspend.
|
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.El
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.Pp
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The following options will remove some features from the
|
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.Nm
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driver and save kernel memory.
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.Bl -tag -width MOUSE
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.It Dv SC_NO_CUTPASTE
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This option disables ``copy and paste'' operation in virtual
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terminals.
|
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.It Dv SC_NO_FONT_LOADING
|
|
The
|
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.Nm
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driver can load software fonts on some video cards.
|
|
This option removes this feature.
|
|
Note that if you still wish to use
|
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the mouse with this option then you must also use the
|
|
.Dv SC_ALT_MOUSE_IMAGE
|
|
option.
|
|
.It Dv SC_NO_HISTORY
|
|
This option disables back-scrolling in virtual terminals.
|
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.\".It Dv SC_NO_PALETTE_LOADING
|
|
.It Dv SC_NO_SYSMOUSE
|
|
This option removes mouse support in the
|
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.Nm
|
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driver.
|
|
The mouse daemon
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.Xr moused 8
|
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will fail if this option is defined.
|
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This option implies the
|
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.Dv SC_NO_CUTPASTE
|
|
option too.
|
|
.It Dv SC_NO_TERM_DUMB
|
|
.It Dv SC_NO_TERM_SC
|
|
.It Dv SC_NO_TERM_SCTEKEN
|
|
These options remove the
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.Qq dumb ,
|
|
.Qq sc ,
|
|
and
|
|
.Qq scteken
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|
terminal emulators, respectively.
|
|
.El
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.Ss Driver Flags
|
|
The following driver flags can be used to control the
|
|
.Nm
|
|
driver.
|
|
Driver flags can be set with the
|
|
.Cd hint.sc.0.flags
|
|
tunable, either in
|
|
.Pa /boot/device.hints ,
|
|
or else at the loader prompt (see
|
|
.Xr loader 8 ) .
|
|
.Bl -tag -width bit_0
|
|
.\".It bit 0 (VISUAL_BELL)
|
|
.\"Uses the ``visual'' bell.
|
|
.\"The screen will blink instead of generating audible sound.
|
|
.\".It bit 1,2 (CURSOR_TYPE)
|
|
.\"This option specifies the cursor appearance.
|
|
.\"Possible values are:
|
|
.\".Bl -tag -width TYPE -compact
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|
.\".It Dv 0
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|
.\"normal block cursor
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|
.\".It Dv 2
|
|
.\"blinking block cursor
|
|
.\".It Dv 4
|
|
.\"underline cursor
|
|
.\".It Dv 6
|
|
.\"blinking underline (aka destructive) cursor
|
|
.\".El
|
|
.\".It bit 6 (QUIET_BELL)
|
|
.\"This option suppresses the bell, whether audible or visual,
|
|
.\"if it is rung in a background virtual terminal.
|
|
.It 0x0080 (VESAMODE)
|
|
This option puts the video card in the VESA mode specified by
|
|
.Pa /boot/device.hints
|
|
variable
|
|
.Va vesa_mode
|
|
during kernel initialization.
|
|
Note that in order for this flag to work, the kernel must be
|
|
compiled with the
|
|
.Dv SC_PIXEL_MODE
|
|
option explained above.
|
|
A list of the available mode can be obtained via
|
|
.Xr vidcontrol 1 .
|
|
.\"Note also that the ``copy-and-paste'' function is not currently supported
|
|
.\"in this mode and the mouse pointer will not be displayed.
|
|
.It 0x0100 (AUTODETECT_KBD)
|
|
This option instructs the syscons driver to periodically scan
|
|
for a keyboard device if it is not currently attached to one.
|
|
Otherwise, the driver only probes for a keyboard once during bootup.
|
|
.El
|
|
.Ss Loader Tunables
|
|
These settings can be entered at the
|
|
.Xr loader 8
|
|
prompt or in
|
|
.Xr loader.conf 5 .
|
|
.Bl -tag -width indent
|
|
.It Va kern.vty
|
|
When both
|
|
.Nm
|
|
and
|
|
.Xr vt 4
|
|
have been compiled into the kernel, the one to use for the system console can
|
|
be selected by setting this variable to
|
|
.Ql sc
|
|
or
|
|
.Ql vt .
|
|
The
|
|
.Pa GENERIC
|
|
kernel uses
|
|
.Xr vt 4
|
|
when this value is not set.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width /usr/share/syscons/xxxxyyyyzzz -compact
|
|
.It Pa /dev/console
|
|
.It Pa /dev/consolectl
|
|
.It Pa /dev/ttyv?
|
|
virtual terminals
|
|
.It Pa /etc/ttys
|
|
terminal initialization information
|
|
.It Pa /usr/share/syscons/fonts/*
|
|
font files
|
|
.It Pa /usr/share/syscons/keymaps/*
|
|
key map files
|
|
.It Pa /usr/share/syscons/scrmaps/*
|
|
screen map files
|
|
.El
|
|
.Sh EXAMPLES
|
|
As the
|
|
.Nm
|
|
driver requires the keyboard driver and the video card driver,
|
|
the kernel configuration file should contain the following lines.
|
|
.Bd -literal -offset indent
|
|
device atkbdc
|
|
device atkbd
|
|
device vga
|
|
device sc
|
|
device splash
|
|
.Ed
|
|
.Pp
|
|
You also need the following lines in
|
|
.Pa /boot/device.hints
|
|
for these drivers.
|
|
.Bd -literal -offset indent
|
|
hint.atkbdc.0.at="isa"
|
|
hint.atkbdc.0.port="0x060"
|
|
hint.atkbd.0.at="atkbdc"
|
|
hint.atkbd.0.irq="1"
|
|
hint.vga.0.at="isa"
|
|
hint.sc.0.at="isa"
|
|
.Ed
|
|
.Pp
|
|
If you do not intend to load the splash image or use the screen saver,
|
|
the last line is not necessary, and can be omitted.
|
|
.Pp
|
|
Note that the keyboard controller driver
|
|
.Nm atkbdc
|
|
is required by the keyboard driver
|
|
.Nm atkbd .
|
|
.Pp
|
|
The following lines will set the default colors.
|
|
The normal text will be green on black background.
|
|
The reversed text will be yellow on green background.
|
|
Note that you cannot put any white space inside the quoted string,
|
|
because of the current implementation of
|
|
.Xr config 8 .
|
|
.Pp
|
|
.Dl "options SC_NORM_ATTR=(FG_GREEN|BG_BLACK)"
|
|
.Dl "options SC_NORM_REV_ATTR=(FG_YELLOW|BG_GREEN)"
|
|
.Pp
|
|
The following lines will set the default colors of the kernel message.
|
|
The kernel message will be printed bright red on black background.
|
|
The reversed message will be black on red background.
|
|
.Pp
|
|
.Dl "options SC_KERNEL_CONS_ATTR=(FG_LIGHTRED|BG_BLACK)"
|
|
.Dl "options SC_KERNEL_CONS_REV_ATTR=(FG_BLACK|BG_RED)"
|
|
.Pp
|
|
Provided
|
|
.Dv SC_KERNEL_CONS_ATTR
|
|
is not set, or is set to its default of bright white on black,
|
|
the following line will set 4 red-ish colors
|
|
for printing kernel messages in colors depending on the CPU.
|
|
.Pp
|
|
.Dl options SC_KERNEL_CONS_ATTRS=\e"\ex0c\ex04\ex40\ex0e\e"
|
|
.Pp
|
|
The default scheme is probably better for up to 8 CPUs.
|
|
Use a long string to get unique colors for more than 8 CPUs.
|
|
.Pp
|
|
To turn off all per-CPU coloring of kernel messages,
|
|
set SC_KERNEL_CONS_ATTR to a non-default value,
|
|
or use the default in a pattern of length 1.
|
|
.Pp
|
|
.Dl options SC_KERNEL_CONS_ATTRS=\e"\ex0f\e"
|
|
.Pp
|
|
The following example adds the font files
|
|
.Pa cp850-8x16.fnt ,
|
|
.Pa cp850-8x14.font
|
|
and
|
|
.Pa cp850-8x8.font
|
|
to the kernel.
|
|
.Pp
|
|
.Dl "options SC_DFLT_FONT"
|
|
.Dl "makeoptions SC_DFLT_FONT=cp850"
|
|
.Dl "device sc"
|
|
.\".Sh DIAGNOSTICS
|
|
.Sh SEE ALSO
|
|
.Xr kbdcontrol 1 ,
|
|
.Xr login 1 ,
|
|
.Xr vidcontrol 1 ,
|
|
.Xr atkbd 4 ,
|
|
.Xr atkbdc 4 ,
|
|
.Xr keyboard 4 ,
|
|
.Xr screen 4 ,
|
|
.Xr splash 4 ,
|
|
.Xr ukbd 4 ,
|
|
.Xr vga 4 ,
|
|
.Xr vt 4 ,
|
|
.Xr kbdmap 5 ,
|
|
.Xr rc.conf 5 ,
|
|
.Xr ttys 5 ,
|
|
.Xr config 8 ,
|
|
.Xr getty 8 ,
|
|
.Xr kldload 8 ,
|
|
.Xr moused 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver first appeared in
|
|
.Fx 1.0 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm
|
|
driver was written by
|
|
.An S\(/oren Schmidt Aq Mt sos@FreeBSD.org .
|
|
This manual page was written by
|
|
.An Kazutaka Yokota Aq Mt yokota@FreeBSD.org .
|
|
.Sh CAVEATS
|
|
The amount of data that is possible to insert from the cut buffer is limited
|
|
by the
|
|
.Brq Dv MAX_INPUT ,
|
|
a system limit on the number of bytes that may be stored in the terminal
|
|
input queue - usually 1024 bytes
|
|
(see
|
|
.Xr termios 4 ) .
|
|
.Sh BUGS
|
|
This manual page is incomplete and urgently needs revision.
|