UNIX Recycle Bin - restore function Post: 302472504

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Homework and Emergencies Homework & Coursework Questions UNIX Recycle Bin - restore function Post 302472504 by Corona688 on Wednesday 17th of November 2010 09:51:39 AM

11-17-2010

Registered User

Quote:

Originally Posted by DGPickett

What is it with tar, a command so old it it like going to rent a car and taking the 1962 VW beetle, especially when not leaving the host!

tar is simple, efficient, and works. cpio also works, but its syntax is far more tortuous.

tar also has advantages over cp in some ways. I occasionally prefer it over cp in situations where I need to be very careful where it extracts because cp -R is entirely willing to create a new destination directory even when you didn't mean to. tar on the other hand is very precise and strict about what it creates where.

As for your continual harangues on tar's inefficiency:

Code:

# directory of tiny tiny files
$ du -hs ./code
187M        ./code
# creating a tarball of it
$ tar -cf code.tar code
# Did tar waste gigatons of space?
$ du -hs ./code.tar
184M
# NO, it didn't!  Don't believe me?  Let's look closer.
$ du -s ./code ./code.tar
188236	./code.tar
191296	./code
# Now we create a CPIO archive, which should be wayyyyy better right?
$ find ./code -type f -depth -print | cpio -ov > ./code.cpio
$ ls -l code.tar code.cpio
-rw-r--r-- 1 monttyle monttyle 192747520 Nov 17 08:14 ../code.tar
-rw-r--r-- 1 monttyle monttyle 191435776 Nov 17 08:22 ../code.cpio
$

...and even that minute 0.5% extra reduces to 26 kilobytes out of 100 megs when you compress -- 0.02%.

So tar works absolutely fine, and you really don't need to tell us how awful it is all the time. Thank you.

Corona688

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LEARN ABOUT OPENSOLARIS

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 5.11							    20 Aug 2001 						       rpm2cpio(1)