03-28-2008
Extracting files from corrupted tape
I've got a backuptape in cpio format that was accidentally overwritten with a very small batch file. As I assume that the cpio header has been overwritten, I cannot extract files from the backup in the conventional manner:
( cpio -itv </dev/rct0
cpio: this is not a cpio file, bad header)
I've tried dd if=/dev/rct0 of=output which has produced a single large file The cpio actually records the contents of three directories. As these are large I'm hoping that I can recover data from the second and third directories.
Is there a specific dd expression (or any other expression) that I can use to strip out the contents ?
All suggestions appreciated. Thanks.
Martin
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( cpio -itv </dev/rct0
cpio: this is not a cpio file, bad header)
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rpm2cpio(1) User Commands rpm2cpio(1)
NAME
rpm2cpio - convert Red Hat Package (RPM) to cpio archive
SYNOPSIS
rpm2cpio [file.rpm]
DESCRIPTION
The rpm2cpio utility converts the .rpm file specified as its sole argument to a cpio archive on standard output. (See NOTES.) If no argu-
ment is given, an rpm stream is read from standard input. In both cases, rpm2cpio will fail and print a usage message if the standard out-
put is a terminal. Therefore, the output is usually redirected to a file or piped through the cpio(1) utility.
EXAMPLES
Example 1: Converting an rpm file
example% rpm2cpio Device3Dfx-1.1-2.src.rpm | cpio -itv
CPIO archive found!
-rw-r--r-- 1 root root 2635 Sep 13 16:39 1998, 3dfx.gif
-rw-r--r-- 1 root root 11339 Sep 27 16:03 1998, Dev3Dfx.tar.gz
-rw-r--r-- 1 root root 1387 Sep 27 16:04 1998, Device3Dfx-1.1-2.spec
31 blocks
Example 2: Converting from standard input
example% rpm2cpio < Device3Dfx-1.1-2.src.rpm | cpio -itv
CPIO archive found!
-rw-r--r-- 1 root root 2635 Sep 13 16:39 1998, 3dfx.gif
-rw-r--r-- 1 root root 11339 Sep 27 16:03 1998, Dev3Dfx.tar.gz
-rw-r--r-- 1 root root 1387 Sep 27 16:04 1998, Device3Dfx-1.1-2.spec
31 blocks
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWrpm |
+-----------------------------+-----------------------------+
SEE ALSO
cpio(1), attributes(5)
NOTES
rpm2cpio handles versions 3 and 4 RPMs.
SunOS 5.10 20 Aug 2001 rpm2cpio(1)