11-17-2010
Quote:
Originally Posted by
DGPickett
Maybe it was that tar I got on my favorite jacket at Mystic Seaport.
You seem to have a newer tar, that has compression and allows '-' arguments, but there are some really old ones out there that do not behave as normally or nice.
I gzipped the files after.
tar and cpio were standardized at the same time. You might also find it illuminating that POSIX-2001 restandardized the tar format in a backwards-compatible way to support files >8GB, but cpio couldn't be adapted -- they
removed it from POSIX instead. It's gone.
In short -- tar won, cpio lost. On many of my systems it didn't even come with the base OS!
Quote:
This forum is not UNIX-flavor-specific, and I hate it when an old command refuses my examples!
Preaching to the choir, my friend.
![Smilie Smilie](https://www.unix.com/images/smilies/smile.gif)
My personal bugbear is solaris /bin/sh...
Quote:
Also tar does not have a linking to original, not copying, option like cpio pass and cp, since when space was a concern and overwrite was not, the object was to create a clone tree of hard links?
This is true. tar and cpio are not totally equivalent in functionality.
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LEARN ABOUT SUNOS
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)