restore -R [-cvy] [-b blocksize] [-f file] [-s fileno]
restore -r [-cvy] [-b blocksize] [-f file] [-s fileno]
restore -t [-chvy] [-b blocksize] [-f file] [-s fileno] [file ...]
restore -x [-chmvy] [-b blocksize] [-f file] [-s fileno] [file ...]
(The 4.3BSD option syntax is implemented for backward compatibility, but
is not documented here.)
DESCRIPTION
The restore command 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. Restore works across a network;
to do this see the -f flag described below. Other arguments to the com-
mand 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. Restore will ask which vol-
ume the user wishes to mount. The fastest way to
quit Restore immediately exits, 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.
-R Restore requests a particular tape of a multi volume set on which
to restart a full restore (see the -r flag below). This is use-
ful 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'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 interactive file
extraction and can be detrimental to one's health if not used
carefully (not to mention the disk). An example:
newfs /dev/rrp0g eagle
mount /dev/rp0g /mnt
cd /mnt
restore rf /dev/rst8
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.
Restore, 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-
-f file
Read the backup from file; file may be a special device file like
/dev/rmt12 (a tape drive), /dev/rsd1c (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).
-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.
-s fileno
Read from the specified fileno on a multi-file tape. File num-
bering starts at 1.
-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.
DIAGNOSTICS
Complaints 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.
Converting to new file system format.
A dump tape created from the old file system has been loaded. It
is automatically converted to the new file system format.
<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>
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.
FILES
/dev/rmt? 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.
SEE ALSO
dump(8), newfs(8), mount(8), mkfs(8), rmt(8)
BUGS
Restore can get confused when doing incremental restores from dumps that
were made on active file systems.
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.
HISTORY
The restore command appeared in 4.2BSD.
4th Berkeley Distribution May 1, 1995 4th Berkeley Distribution
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