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Top Forums UNIX for Dummies Questions & Answers Extracting files from corrupted tape Post 302179609 by mart4179 on Friday 28th of March 2008 06:40:51 AM
Old 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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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)
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