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dvhtool - modify and obtain disk volume header information
dvhtool [-v [creat unix_file dvh_file]
[add unix_file dvh_file] [delete dvh_file]
[get dvh_file unix_file] [list]] [header_filename]
dvhtool is used to copy files to and from the volume header of disks.
Formerly it had other functions also, but these have long been deprecated
and have been removed.
The disk volume header consists of two main parts: the partition table,
and the volume directory. The volume directory is used to locate files
kept in the volume header area of the disk for standalone use. The
partition table describes the logical device partitions.
You must be superuser to use dvhtool.
Invoked with no arguments (or just a volume header name,
header_filename), dvhtool allows you to examine and modify the disk
volume header on the root drive interactively. The read command prompts
for the name of the device file for the volume header to be worked on.
This can be /dev/rvh for the header of the root disk or the header name
of another disk in the /dev/rdsk directory. See vh(7M). It then reads
the volume header from the specified device.
The write command writes the possibly modified volume header to the
Invoked with arguments, dvhtool reads the volume header, performs the
specified operations, and then writes the volume header. If no
header_filename is specified on the command line, /dev/rvh is used.
The following describes dvhtool command-line arguments.
-v Provides five options for modifying and listing the contents of the
volume directory information in the disk volume header: create, add,
delete, get, and list.
Allows creation of a volume directory entry with the name dvh_file
and the contents of unix_file. If an entry already exists with the
name dvh_file, it is overwritten with the new contents.
add Adds a volume directory entry with the name dvh_file and the
contents of unix_file. Unlike the creat option, the add options do
not overwrite an existing entry.
Removes the entry named dvh_file, if it exists, from the volume
get Copies the requested file from the volume header to the filesystem.
list Lists the current volume directory contents.
fx(1M), prtvtoc(1M), vh(7M).
Several megabytes of disk space may be required in the /tmp directory
when creating or adding files if the free space in the volume header is
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