NAME
restor - incremental file system restore
SYNOPSIS
restor key [ arguments ]
DESCRIPTION
Restor is used to read magtapes dumped with the dump com-
mand. The key argument specifies what is to be done. Key
is a character from the set trxw.
t The date that the tape was made and the date that was
specified in the dump command are printed. A list of
all of the i-numbers on the tape is also given.
r The tape is read and loaded into the file system speci-
fied in arguments. This should not be done lightly
(see below).
x Each file on the tape is individually extracted into a
file whose name is the file's i-number. If there are
arguments, they are interpreted as i-numbers and only
they are extracted.
c If the tape overflows, increment the last character of
its name and continue on that drive. (Normally it asks
you to change tapes.)
f Read the dump from the next argument file instead of
the tape.
i All read and checksum errors are reported, but will not
cause termination.
w In conjunction with the x option, before each file is
extracted, its i-number is typed out. To extract this
file, you must respond with y.
The x option is used to retrieve individual files. If the
i-number of the desired file is not known, it can be discov-
ered by following the file system directory search algo-
rithm. First retrieve the root directory whose i-number is
1. List this file with ls -fi 1. This will give names and
i-numbers of sub-directories. Iterating, any file may be
retrieved.
The r option should only be used to restore a complete dump
tape onto a clear file system or to restore an incremental
dump tape onto this. Thus
/etc/mkfs /dev/rp0 40600
restor r /dev/rp0
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is a typical sequence to restore a complete dump. Another
restor can be done to get an incremental dump in on top of
this.
A dump followed by a mkfs and a restor is used to change the
size of a file system.
FILES
/dev/mt0
SEE ALSO
ls (I), dump (VIII), mkfs (VIII), clri (VIII)
DIAGNOSTICS
There are various diagnostics involved with reading the tape
and writing the disk. There are also diagnostics if the i-
list or the free list of the file system is not large enough
to hold the dump.
If the dump extends over more than one tape, it may ask you
to change tapes. Reply with a new-line when the next tape
has been mounted.
BUGS
There is redundant information on the tape that could be
used in case of tape reading problems. Unfortunately,
restor's approach is to exit if anything is wrong.
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