|Home||Switchboard||Unix Administration||Red Hat||TCP/IP Networks||Neoliberalism||Toxic Managers|
May the source be with you, but remember the KISS principle ;-)
Skepticism and critical thinking is not panacea, but can help to understand the world better
7za [adeltux] [-] [SWITCH] <ARCHIVE_NAME>< ARGUMENTS>...
7-Zip is a file archiver with the highest compression ratio. The program supports 7z (that implements LZMA compression algorithm), ZIP, CAB, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB formats. Compression ratio in the new 7z format is 30-50% better than ratio in ZIP format.
- Normal (no errors or warnings detected)
- Warning (Non fatal error(s)). For example, some files cannot be read during compressing. So they were not compressed
- Fatal error
- Bad command line parameters
- Not enough memory for operation
- User stopped the process with control-C (or similar)
On Linux/Unix, in order to backup directories you must use tar : - to backup a directory : tar cf - directory | 7za a -si
- to restore your backup : 7za x -so directory.tar.7z | tar xf -
If you want to send files and directories (not the owner of file) to others Unix/MacOS/Windows users, you can use the 7-zip format.
example : 7za a directory.7z directory
Do not use "-r" because this flag does not do what you think.
Do not use directory/* because of ".*" files (example : "directory/*" does not match "directory/.profile")
May 28, 2018 | www.reddit.com
TIP: 7-zip's XZ compression on a multiprocessor system is often faster and compresses better than gzip ( self.linuxadmin )
TyIzaeL line"> [–] kristopolous 4 years ago (4 children)I did this a while back also. Here's a graph: http://i.imgur.com/gPOQBfG.pngTyIzaeL 4 years ago (3 children)
X axis is compression level (min to max) Y is the size of the file that was compressed
I forget what the file was.That is a great start (probably better than what I am doing). Do you have time comparisons as well?kristopolous 4 years ago (1 child)http://www.reddit.com/r/linuxquestions/comments/1gdvnc/best_file_compression_format/caje4hm there's the postTyIzaeL 4 years ago (0 children)Very nice. I might work on something similar to this soon next time I'm bored.kristopolous 4 years ago (0 children)nope.TyIzaeL 4 years ago (0 children)That's a great point to consider among all of this. Compression is always a tradeoff between how much CPU and memory you want to throw at something and how much space you would like to save. In my case, hammering the server for 3 minutes in order to take a backup is necessary because the uncompressed data would bottleneck at the LAN speed.randomfrequency 4 years ago (0 children)You might want to play with 'pigz' - it's gzip, multi-threaded. You can 'pv' to restrict the rate of the output, and it accepts signals to control the rate limiting.rrohbeck 4 years ago (1 child)Also pbzip2 -1 to -9 and pigz -1 to -9.TyIzaeL 4 years ago (0 children)
With -9 you can surely make backup CPU bound. I've given up on compression though: rsync is much faster than straight backup and I use btrfs compression/deduplication/snapshotting on the backup server.pigz -9 is already on the chart as pigz --best. I'm working on adding the others though.TyIzaeL 4 years ago (0 children)I'm running gzip, bzip2, and pbzip2 now (not at the same time, of course) and will add results soon. But in my case the compression keeps my db dumps from being IO bound by the 100mbit LAN connection. For example, lzop in the results above puts out 6041.632 megabits in 53.82 seconds for a total compressed data rate of 112 megabits per second, which would make the transfer IO bound. Whereas the pigz example puts out 3339.872 megabits in 81.892 seconds, for an output data rate of 40.8 megabits per second. This is just on my dual-core box with a static file, on the 8-core server I see the transfer takes a total of about three minutes. It's probably being limited more by the rate at which the MySQL server can dump text from the database, but if there was no compression it'd be limited by the LAN speed. If we were dumping 2.7GB over the LAN directly, we would need 122mbit/s of real throughput to complete it in three minutes.Shammyhealz 4 years ago (2 children)I thought the best compression was supposed to be LZMA? Which is what the .7z archives are. I have no idea of the relative speed of LZMA and gzipTyIzaeL 4 years ago (1 child)xz archives use the LZMA2 format (which is also used in 7z archives). LZMA2 speed seems to range from a little slower than gzip to much slower than bzip2, but results in better compression all around.primitive_screwhead 4 years ago (0 children)However LZMA2 decompression speed is generally much faster than bzip2, in my experience, though not as fast as gzip. This is why we use it, as we decompress our data much more often than we compress it, and the space saving/decompression speed tradeoff is much more favorable for us than either gzip of bzip2.crustang 4 years ago (2 children)I mentioned how 7zip was superior to all other zip programs in /r/osx a few days ago and my comment was burried in favor of the the osx circlejerk .. it feels good seeing this data.RTFMorGTFO 4 years ago (1 child)
I love 7zipWhy... Tar supports xz, lzma, lzop, lzip, and any other kernel based compression algorithms. Its also much more likely to be preinstalled on your given distro.crustang 4 years ago (0 children)I've used 7zip at my old job for a backup of our business software's database. We needed speed, high level of compression, and encryption. Portability wasn't high on the list since only a handful of machines needed access to the data. All machines were multi-processor and 7zip gave us the best of everything given the requirements. I haven't really looked at anything deeply - including tar, which my old boss didn't care for.
May 28, 2018 | rpm.pbone.netp7zip rpm build for : RedHat EL 6 . For other distributions click p7zip .
Name : p7zip Version : 9.20.1 Vendor : Dag Apt Repository, http://dag_wieers_com/apt/ Release : 1.el6.rf Date : 2011-04-20 15:23:34 Group : Applications/Archiving Source RPM : p7zip-9.20.1-1.el6.rf.src.rpm Size : 14.84 MB Packager : Dag Wieers < dag_wieers_com> Summary : Very high compression ratio file archiver Description :
p7zip is a port of 7za.exe for Unix. 7-Zip is a file archiver with a very high
compression ratio. The original version can be found at http://www.7-zip.org/.
RPM found in directory: /mirror/apt.sw.be/redhat/el6/en/x86_64/rpmforge/RPMS
Content of RPM Changelog Provides Requires
ftp.univie.ac.at p7zip-9.20.1-1.el6.rf.x86_64.rpm ftp.rediris.es p7zip-9.20.1-1.el6.rf.x86_64.rpm ftp.icm.edu.pl p7zip-9.20.1-1.el6.rf.x86_64.rpm ftp.pbone.net p7zip-9.20.1-1.el6.rf.x86_64.rpm ftp.pbone.net p7zip-9.20.1-1.el6.rf.x86_64.rpm ftp.pbone.net p7zip-9.20.1-1.el6.rf.x86_64.rpm ftp.is.co.za p7zip-9.20.1-1.el6.rf.x86_64.rpm
Google matched content
Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers : Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism : The Iron Law of Oligarchy : Libertarian Philosophy
War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda : SE quotes : Language Design and Programming Quotes : Random IT-related quotes : Somerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose Bierce : Bernard Shaw : Mark Twain Quotes
Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 : Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law
Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds : Larry Wall : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOS : Programming Languages History : PL/1 : Simula 67 : C : History of GCC development : Scripting Languages : Perl history : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history
The Peter Principle : Parkinson Law : 1984 : The Mythical Man-Month : How to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Hater’s Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite
Most popular humor pages:
Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor
The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D
Copyright © 1996-2020 by Softpanorama Society. www.softpanorama.org was initially created as a service to the (now defunct) UN Sustainable Development Networking Programme (SDNP) without any remuneration. This document is an industrial compilation designed and created exclusively for educational use and is distributed under the Softpanorama Content License. Original materials copyright belong to respective owners. Quotes are made for educational purposes only in compliance with the fair use doctrine.
FAIR USE NOTICE This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available to advance understanding of computer science, IT technology, economic, scientific, and social issues. We believe this constitutes a 'fair use' of any such copyrighted material as provided by section 107 of the US Copyright Law according to which such material can be distributed without profit exclusively for research and educational purposes.
This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Grammar and spelling errors should be expected. The site contain some broken links as it develops like a living tree...
|You can use PayPal to to buy a cup of coffee for authors of this site|
Last modified: May, 31, 2018