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Managing File Systems in Oracle® Solaris 11.4

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Updated: November 2020

Specifying the ufsdump Command Options and Arguments

This section describes the options and arguments for the ufsdump command. The syntax for the ufsdump command is as follows:

/usr/sbin/ufsdump options arguments filenames

Single string of one-letter option names.


Identifies option arguments and might consist of multiple strings. The option letters and their associated arguments must be in the same order.


Identifies the files to back up. These arguments must always come last, each separated by a space.

Default ufsdump Options

You can run the ufsdump without any options by using the following syntax:

# ufsdump filenames

The ufsdump command uses the following options and arguments, by default:

# ufsdump 9uf /dev/rmt/0 filenames

The option, 9in the ufsdump command will do a level 9 incremental backup of all the modified files to the default tape drive since the previous backup.

The –u option is used to update the /etc/dumpdates file with information about the current backup. The /etc/dumpdates contains information about the previous backup and can decide which are the files to be backed-up.

The f /dev/rmt/0 option sends backup to the first tape device directly connected to an Oracle Solaris system.

For more information, see the ufsdump(8) man page.

The ufsdump Command and Security Issues

Consider the following aspects to ensure that there are no security issues with the file system:

  • Require superuser access to use the ufsdump command.

  • If you are performing centralized backups, ensure that superuser access entries are removed from the /.rhosts files on the clients and servers.

For more information, see Oracle Solaris 11.4 Security and Hardening Guidelines.