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RESTORE(8)		FreeBSD	System Manager's Manual		    RESTORE(8)

NAME
     restore, rrestore -- restore files	or file	systems	from backups made with
     dump

SYNOPSIS
     restore -i	[-dDhmNuvy] [-b	blocksize] [-f file | -P pipecommand]
	     [-s fileno]
     restore -R	[-dDNuvy] [-b blocksize] [-f file | -P pipecommand]
	     [-s fileno]
     restore -r	[-dDNuvy] [-b blocksize] [-f file | -P pipecommand]
	     [-s fileno]
     restore -t	[-dDhNuvy] [-b blocksize] [-f file | -P	pipecommand]
	     [-s fileno] [file ...]
     restore -x	[-dDhmNuvy] [-b	blocksize] [-f file | -P pipecommand]
	     [-s fileno] [file ...]

     rrestore is an alternate name for restore.

     (The 4.3BSD option	syntax is implemented for backward compatibility, but
     is	not documented here.)

DESCRIPTION
     The restore utility performs the inverse function of dump(8).  A full
     backup of a file system may be restored and subsequent incremental	back-
     ups layered on top	of it.	Single files and directory subtrees may	be
     restored from full	or partial backups.  The restore utility works across
     a network;	to do this see the -f and -P flags described below.  Other
     arguments to the command are file or directory names specifying the files
     that are to be restored.  Unless the -h flag is specified (see below),
     the appearance of a directory name	refers to the files and	(recursively)
     subdirectories of that directory.

     Exactly one of the	following flags	is required:

     -i	     This mode allows interactive restoration of files from a dump.
	     After reading in the directory information	from the dump, restore
	     provides a	shell like interface that allows the user to move
	     around the	directory tree selecting files to be extracted.	 The
	     available commands	are given below; for those commands that
	     require an	argument, the default is the current directory.

	     add [arg]	 The current directory or specified argument is	added
			 to the	list of	files to be extracted.	If a directory
			 is specified, then it and all its descendents are
			 added to the extraction list (unless the -h flag is
			 specified on the command line).  Files	that are on
			 the extraction	list are prepended with	a ``*''	when
			 they are listed by ls.

	     cd	arg	 Change	the current working directory to the specified
			 argument.

	     delete [arg]
			 The current directory or specified argument is
			 deleted from the list of files	to be extracted.  If a
			 directory is specified, then it and all its descen-
			 dents are deleted from	the extraction list (unless
			 the -h	flag is	specified on the command line).	 The
			 most expedient	way to extract most of the files from
			 a directory is	to add the directory to	the extraction
			 list and then delete those files that are not needed.

	     extract	 All the files that are	on the extraction list are
			 extracted from	the dump.  The restore utility will
			 ask which volume the user wishes to mount.  The
			 fastest way to	extract	a few files is to start	with
			 the last volume, and work towards the first volume.

	     help	 List a	summary	of the available commands.

	     ls	[arg]	 List the current or specified directory.  Entries
			 that are directories are appended with	a ``/''.
			 Entries that have been	marked for extraction are
			 prepended with	a ``*''.  If the verbose flag is set
			 the inode number of each entry	is also	listed.

	     pwd	 Print the full	pathname of the	current	working	direc-
			 tory.

	     quit	 Exit immediately, even	if the extraction list is not
			 empty.

	     setmodes	 All the directories that have been added to the
			 extraction list have their owner, modes, and times
			 set; nothing is extracted from	the dump.  This	is
			 useful	for cleaning up	after a	restore	has been pre-
			 maturely aborted.

	     verbose	 The sense of the -v flag is toggled.  When set, the
			 verbose flag causes the ls command to list the	inode
			 numbers of all	entries.  It also causes restore to
			 print out information about each file as it is
			 extracted.

	     what	 Display dump header information, which	includes:
			 date, level, label, and the file system and host dump
			 was made from.

     -R	     Request a particular tape of a multi volume set on	which to
	     restart a full restore (see the -r	flag below).  This is useful
	     if	the restore has	been interrupted.

     -r	     Restore (rebuild a	file system).  The target file system should
	     be	made pristine with newfs(8), mounted and the user cd(1)'d into
	     the pristine file system before starting the restoration of the
	     initial level 0 backup.  If the level 0 restores successfully,
	     the -r flag may be	used to	restore	any necessary incremental
	     backups on	top of the level 0.  The -r flag precludes an interac-
	     tive file extraction and can be detrimental to one's health if
	     not used carefully	(not to	mention	the disk).  An example:

		   newfs /dev/da0s1a
		   mount /dev/da0s1a /mnt
		   cd /mnt

		   restore rf /dev/sa0

	     Note that restore leaves a	file restoresymtable in	the root
	     directory to pass information between incremental restore passes.
	     This file should be removed when the last incremental has been
	     restored.

	     The restore utility , in conjunction with newfs(8)	and dump(8),
	     may be used to modify file	system parameters such as size or
	     block size.

     -t	     The names of the specified	files are listed if they occur on the
	     backup.  If no file argument is given, then the root directory is
	     listed, which results in the entire content of the	backup being
	     listed, unless the	-h flag	has been specified.  Note that the -t
	     flag replaces the function	of the old dumpdir(8) program.

     -x	     The named files are read from the given media.  If	a named	file
	     matches a directory whose contents	are on the backup and the -h
	     flag is not specified, the	directory is recursively extracted.
	     The owner,	modification time, and mode are	restored (if possi-
	     ble).  If no file argument	is given, then the root	directory is
	     extracted,	which results in the entire content of the backup
	     being extracted, unless the -h flag has been specified.

     The following additional options may be specified:

     -b	blocksize
	     The number	of kilobytes per dump record.  If the -b option	is not
	     specified,	restore	tries to determine the media block size	dynam-
	     ically.

     -d	     Sends verbose debugging output to the standard error.

     -D	     This puts restore into degraded mode, causing restore to operate
	     less efficiently but to try harder	to read	corrupted backups.

     -f	file
	     Read the backup from file;	file may be a special device file like
	     /dev/sa0 (a tape drive), /dev/da1c	(a disk	drive),	an ordinary
	     file, or `-' (the standard	input).	 If the	name of	the file is of
	     the form ``host:file'', or	``user@host:file'', restore reads from
	     the named file on the remote host using rmt(8).

     -P	pipecommand
	     Use popen(3) to execute the sh(1) script string defined by
	     pipecommand as the	input for every	volume in the backup.  This
	     child pipeline's stdout (/dev/fd/1) is redirected to the restore
	     input stream, and the environment variable	RESTORE_VOLUME is set
	     to	the current volume number being	read.  The pipecommand script
	     is	started	each time a volume is loaded, as if it were a tape
	     drive.

     -h	     Extract the actual	directory, rather than the files that it ref-
	     erences.  This prevents hierarchical restoration of complete sub-
	     trees from	the dump.

     -m	     Extract by	inode numbers rather than by file name.	 This is use-
	     ful if only a few files are being extracted, and one wants	to
	     avoid regenerating	the complete pathname to the file.

     -N	     Do	the extraction normally, but do	not actually write any changes
	     to	disk.  This can	be used	to check the integrity of dump media
	     or	other test purposes.

     -s	fileno
	     Read from the specified fileno on a multi-file tape.  File	num-
	     bering starts at 1.

     -u	     When creating certain types of files, restore may generate	a
	     warning diagnostic	if they	already	exist in the target directory.
	     To	prevent	this, the -u (unlink) flag causes restore to remove
	     old entries before	attempting to create new ones.

     -v	     Normally restore does its work silently.  The -v (verbose)	flag
	     causes it to type the name	of each	file it	treats preceded	by its
	     file type.

     -y	     Do	not ask	the user whether to abort the restore in the event of
	     an	error.	Always try to skip over	the bad	block(s) and continue.

ENVIRONMENT
     TAPE    Device from which to read backup.

     TMPDIR  Name of directory where temporary files are to be created.

FILES
     /dev/sa0		the default tape drive
     /tmp/rstdir*	file containing	directories on the tape.
     /tmp/rstmode*	owner, mode, and time stamps for directories.
     ./restoresymtable	information passed between incremental restores.

DIAGNOSTICS
     The restore utility complains if it gets a	read error.  If	-y has been
     specified,	or the user responds `y', restore will attempt to continue the
     restore.

     If	a backup was made using	more than one tape volume, restore will	notify
     the user when it is time to mount the next	volume.	 If the	-x or -i flag
     has been specified, restore will also ask which volume the	user wishes to
     mount.  The fastest way to	extract	a few files is to start	with the last
     volume, and work towards the first	volume.

     There are numerous	consistency checks that	can be listed by restore.
     Most checks are self-explanatory or can ``never happen''.	Common errors
     are given below.

     <filename>: not found on tape
	     The specified file	name was listed	in the tape directory, but was
	     not found on the tape.  This is caused by tape read errors	while
	     looking for the file, and from using a dump tape created on an
	     active file system.

     expected next file	<inumber>, got <inumber>
	     A file that was not listed	in the directory showed	up.  This can
	     occur when	using a	dump created on	an active file system.

     Incremental dump too low
	     When doing	incremental restore, a dump that was written before
	     the previous incremental dump, or that has	too low	an incremental
	     level has been loaded.

     Incremental dump too high
	     When doing	incremental restore, a dump that does not begin	its
	     coverage where the	previous incremental dump left off, or that
	     has too high an incremental level has been	loaded.

     Tape read error while restoring <filename>
     Tape read error while skipping over inode <inumber>
     Tape read error while trying to resynchronize
	     A tape (or	other media) read error	has occurred.  If a file name
	     is	specified, then	its contents are probably partially wrong.  If
	     an	inode is being skipped or the tape is trying to	resynchronize,
	     then no extracted files have been corrupted, though files may not
	     be	found on the tape.

     resync restore, skipped <num> blocks
	     After a dump read error, restore may have to resynchronize
	     itself.  This message lists the number of blocks that were
	     skipped over.

SEE ALSO
     dump(8), mount(8),	newfs(8), rmt(8)

HISTORY
     The restore utility appeared in 4.2BSD.

BUGS
     The restore utility can get confused when doing incremental restores from
     dumps that	were made on active file systems without the -L	option (see
     dump(8)).

     A level zero dump must be done after a full restore.  Because restore
     runs in user code,	it has no control over inode allocation; thus a	full
     dump must be done to get a	new set	of directories reflecting the new
     inode numbering, even though the contents of the files is unchanged.

     To	do a network restore, you have to run restore as root.	This is	due to
     the previous security history of dump and restore.	 (restore is written
     to	be setuid root,	but we are not certain all bugs	are gone from the
     restore code - run	setuid at your own risk.)

     The temporary files /tmp/rstdir* and /tmp/rstmode*	are generated with a
     unique name based on the date of the dump and the process ID (see
     mktemp(3)), except	for when -r or -R is used.  Because -R allows you to
     restart a -r operation that may have been interrupted, the	temporary
     files should be the same across different processes.  In all other	cases,
     the files are unique because it is	possible to have two different dumps
     started at	the same time, and separate operations should not conflict
     with each other.

FreeBSD	10.1		       October 12, 2006			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | ENVIRONMENT | FILES | DIAGNOSTICS | SEE ALSO | HISTORY | BUGS

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