<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div><br></div><div>I just installed p7zip-full. I checked and verified the existence of man pages for 7z and 7za. </div><div>The following looks like a reliable primer on how to use it:</div><div><br></div><a href="https://www.ibm.com/developerworks/community/blogs/6e6f6d1b-95c3-46df-8a26-b7efd8ee4b57/entry/how_to_use_7zip_on_linux_command_line144?lang=en">https://www.ibm.com/developerworks/community/blogs/6e6f6d1b-95c3-46df-8a26-b7efd8ee4b57/entry/how_to_use_7zip_on_linux_command_line144?lang=en</a><div><br></div><div>For fun I tried it out [1]</div><div><br></div><div>Chris </div><div><br></div><div>[1]</div><div><br></div><div><div>chris*@box*-squeak:~$ 7z a <a href="http://squeak.org">squeak.org</a>.7z <a href="http://squeak.org/">squeak.org/</a></div><div><br></div><div>7-Zip 9.04 beta Copyright (c) 1999-2009 Igor Pavlov 2009-05-30</div><div>p7zip Version 9.04 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,1 CPU)</div><div>Scanning</div><div><br></div><div>Creating archive <a href="http://squeak.org">squeak.org</a>.7z</div><div><br></div><div>Compressing <a href="http://squeak.org/squeakfavicon.ico">squeak.org/squeakfavicon.ico</a></div><div>Compressing <a href="http://squeak.org/Squeak4.4-12327.changes">squeak.org/Squeak4.4-12327.changes</a></div><div>Compressing <a href="http://squeak.org/SqueakDebug.log">squeak.org/SqueakDebug.log</a></div><div>Compressing <a href="http://squeak.org/SqueakV41.sources">squeak.org/SqueakV41.sources</a></div><div>Compressing <a href="http://squeak.org/squeaksite.st">squeak.org/squeaksite.st</a></div><div>Compressing <a href="http://squeak.org/Squeak4.4-12327.image">squeak.org/Squeak4.4-12327.image</a></div><div><br></div><div>Everything is Ok</div><div>chris*@box*-squeak:~$ ls</div><div>coglinux <a href="http://squeak.org">squeak.org</a> <a href="http://squeak.org">squeak.org</a>.7z</div><div><br></div></div><div><br></div><div><br><div><div><br></div><div>On Mar 3, 2014, at 8:49 PM, Levente Uzonyi <<a href="mailto:leves@elte.hu">leves@elte.hu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">On Mon, 3 Mar 2014, Chris Muller wrote:<br><br><blockquote type="cite">Just FYI, bz2 reduces to a size that is about 60% of regular zip.<br></blockquote><br>And 7z[1] with lzma is even better. 7zip[2] can also produce better results for other compression methods, like gzip, zip or bz2. For example the SqueakV41.sources file compressed<br>- using gzip: 6641435 bytes<br>- using gzip -9: 6616622 bytes<br>- 7z a -tgzip -mpass=15 -mfb=258 (this is 7zip creating a gzip archive achiving the best possible compression ratio with this algorithm): 6305658 bytes<br>- bzip2: 5556572 bytes<br>- bzip2 -9: 5556572 bytes (yes, same as above)<br>- 7z a -tbzip2 -mx=9 (7z creating a bz2 archive with "ultra" compression): 5549301 bytes<br>- 7z a (this is 7z with lzma creating a .7z archive): 3966903 bytes<br>- 7z a -mx=9 (same as above with "ultra" compression): 3690018 bytes<br><br>Lzma has been around for 15 years, its compression ratio is clearly better than other methods', so I see no reason why it shouldn't be used.<br><br><br>Levente<br><br>[1] <a href="https://en.wikipedia.org/wiki/7z">https://en.wikipedia.org/wiki/7z</a><br>[2] <a href="https://en.wikipedia.org/wiki/7-Zip">https://en.wikipedia.org/wiki/7-Zip</a><br><br>P.S.: 7zip can also create .zip and .bz2 archives which use lzma as compression method, but that would just confuse people whose decompression tool doesn't support lzma.<br><br><blockquote type="cite"><br>On Sun, Mar 2, 2014 at 6:54 PM, David T. Lewis <<a href="mailto:lewis@mail.msen.com">lewis@mail.msen.com</a>> wrote:<br><blockquote type="cite"><a href="http://box3.squeak.org">box3.squeak.org</a> was up to 97% disk utilization, so I freed up some space as follows:<br><br>davidlewis@box3-squeak:/var/lib/jenkins$ nice gzip -v jobs/SqueakTrunk/builds/[1-6]??/archive/target/TrunkImage.*<br><br>This compresses outputs of the SqueakTrunk job. None of the compressed files<br>are directly referenced from the <a href="http://build.squeak.org">build.squeak.org</a> page so I do not anticipate<br>problems, and the compressed files can be easily uncompressed if anyone needs<br>them.<br><br>I do not know if any of the compressed files are of general interest. If not,<br>they can be deleted to free up more disk space.<br><br>Disk space utilization is now at 83%.<br><br>Dave<br></blockquote><br></blockquote></blockquote></div><br></div></body></html>