04-04-2004
cpio is perhaps bemusingly complex when you're first figuring out how to use it.
According to the syntax you've used there, you're trying to make the shell supply the directory to cpio as an input on stdin.
You might try:
cat backup.cpio | cpio -iumd .
This should pipe in the cpio file to cpio which accepts it as an input ( -i ) and reconstructs the file contents in the "." (the current directory). A word of warning though, always make cpio archives with _relative_ paths, not absolute ones or you're asking for trouble.
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LEARN ABOUT MOJAVE
rpm2cpio
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)