.TH DVHTOOL 8 "July 2000"
.UC 4
.SH NAME
dvhtool \- Disk volume header manipulation tool
.SH SYNOPSIS
.B "dvhtool "
.B \-\-device
.I devicename
[ option ]

.B "dvhtool "
.B \-d
.I devicename
[ option ]
.SH DESCRIPTION
.I dvhtool
is a utility for displaying SGI disk partition and volume header information
as well as for copying files to and from the volume header.

It is similar to the IRIX(tm) utility of the same name, however the options
and usage are quite different.  Also, the IRIX utility cannot display
partition and boot file information.

The disk volume header includes the disk partition table and the volume
directory.  The volume directory is an index to the files stored in the
volume header part of the disk.  These files can be anything but are
usually standalone programs (like
.IR sash ,
the SGI standalone shell).  The space available for files is usually
limited to one, two or a few megabytes, this can only be changed by
repartitioning the disk with
.IR fx ,
the SGI disk formatting and partitioning tool or
.IR fdisk .

You must be root to invoke
.IR dvhtool .
The device name can be
.I /dev/sda
for the first disk, 
.I /dev/sdb
for the second, and so on.

.I dvhtool
will also work on a file image of a disk volume header.

.SM OPTIONS
.BI "\-d,  \-\-device " "devicename"
Specify the volume header device name (or file image)
.TP
.B \-\-print-volume-header
Show volume header data only
.TP
.B \-\-print-volume-directory
Show volume table of contents
.TP
.B \-\-print-partitions
Show partition data
.TP
.B \-\-print-all
Equivalent to all three above options
.TP
.B \-\-vh-remove \fIname\fP
Remove volhdr file
.IR name .
.TP
.B \-\-vh-to-unix \fIname file\fP
Copy volhdr file
.I name
to Unix file
.I file
.TP
.B \-\-unix-to-vh \fIfile name\fP
Copy Unix file
.I file
to volhdr as
.I name
.TP
.B \-\-help
Show usage information

.SH SEE ALSO
fdisk(8)
.TP
IRIX tools: fx(1M), prtvtoc(1M), vh(7M).


.SH AUTHORS
.PP
.I dvhtool
was written by Ralf Baechle <ralf@oss.sgi.com>, Keith M. Wesolowski <wesolows@foobazco.org>,
Tor Arntsen <tor@spacetec.no>, Guido Guenther <agx@debian.org>.