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+.\"-
+.\" Copyright (c) 2007 Robert N. M. Watson
+.\" All rights reserved.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd 25 December, 2007
+.Dt DDB 8
+.Os
+.Sh NAME
+.Nm ddb
+.Nd Configure DDB kernel debugger properties
+.Sh SYNOPSIS
+.Nm
+.Cm script
+.Ar scriptname
+.Nm
+.Cm script
+.Ar scriptname=script
+.Nm
+.Cm scripts
+.Nm
+.Cm unscript
+.Ar scriptname
+.Sh DESCRIPTION
+.Nm
+configures certain aspects of the
+.Xr DDB 4
+kernel debugger from user space that are not configured at compile-time or
+easily via
+.Xr sysctl 8
+MIB entries.
+.Sh SCRIPTING
+.Nm
+can be used to configure aspects of
+.Xr DDB 4
+scripting from user space; scripting support is described in more detail in
+.Xr DDB 4 .
+Each of the debugger commands is available from the command line:
+.Bl -tag -width indent
+.It Cm script Ar scriptname
+Print the script named
+.Ar scriptname .
+.It Cm script Ar scriptname=scriptvalue
+Define a script named
+.Ar scriptname ;
+as many scripts contain characters interpreted in special ways by the shell,
+it is advisable to enclose
+.Ar scriptvalue
+in quotes.
+.It Cm scripts
+List currently defined scripts.
+.It Cm unset Ar scriptname
+Delete the script named
+.Ar scriptname .
+.El
+.Sh EXAMPLES
+The following example defines a script that will execute when the kernel
+debugger is entered as a result of a break signal:
+.Bd -literal -offset indent
+ddb script kdb.enter.break="show pcpu;bt"
+.Ed
+.Pp
+The following example will delete the script:
+.Bd -literal -offset indent
+ddb unscript kdb.enter.break
+.Ed
+.Sh EXIT STATUS
+.Ex -std
+.Sh SEE ALSO
+.Xr DDB 4 ,
+.Xr sysctl 8
+.Sh HISTORY
+.Nm
+first appeared in
+.Fx 8.0 .
+.Sh AUTHORS
+.An Robert N M Watson
+.Sh BUGS
+Ideally,
+.Nm
+would not exist, as all pertinent aspects of
+.Xr DDB 4
+could be configured directly via
+.Xr sysctl 8 .