Red Hat Package Manager, abbreviated RPM, by default, you need install RPM under Red Hat, but some times, we just want to extract something from RPM without installation, how to?
I like using 7-Zip under Windows, it supports many formats:
* Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
* Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, MSI, WIM, Z, CPIO, RPM, DEB and NSIS
so I think I can extract file from RPM with the help of 7-ZIP, but I am not sure if it has Linux version, so I googled it, it does not, but I found alternative, P7ZIP:

p7zip is a port of 7za.exe for POSIX systems like Unix (Linux, Solaris, OpenBSD, FreeBSD, Cygwin, AIX, …), MacOS X and BeOS.

now, I got it.
btw, under Debian or Ubuntu, it is very easy to install it and use,
apt-get install p7zip-full
7z x ABC.RPM
7z x ABC.cpio.gz
7z x ABC.cpio


Description
fcrackzip searches each zipfile given for encrypted files and tries to guess the password. All files must be encrypted with the same password, the more files you provide, the better.

Marc Lehmann releases an Open source zip password cracker, but it only have source and a very old windows version 0.3, so I compiled it under MSys and MingW, you can download the last version(fcrackzip-1.0-win32.zip) now.
for more info about fcrackzip, please visit FCrackZip manual
or Marc Lehmann’s “FCrackZip”

if you need it, please do not hesitate to download it now.
if you want linux version or source code, please download it here(fcrackzip-1.0.tar.gz).

Introduce
Free editor for PDF documents. Complete editing of PDF documents is possible with PDFedit. You can change raw pdf objects (for advanced users) or use many gui functions. Functionality can be easily extended using a scripting language (ECMAScript).

About the Project
Free (and open source) editor for manipulating PDF documents. GUI version + commandline interface.
Scripting is used to a great extent in editor and almost anything can be scripted, it is possible to create own scripts or plugins.
Target platform are operating systems of Unix type (Linux, BSD, …), we are using C++, XPDF, QT3 and QSA.
Note: QT3.x is required, editor can’t be compiled with QT4.x. In most distributions both qt3 and qt4 can be installed at once.
Editor is released under terms of GNU GPL version 2
Home Page
http://pdfedit.petricek.net/index_e.html
http://sourceforge.net/projects/pdfedit
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