Developer comments
Thank you for bringing up the idea of having better support for the .7z format in Ubuntu.
The 7z format is in fact support by file-roller for quite some time but it does require the installation of the command lines utilities to work.
Having p7zip installed by default was discussed in 2008 and decided against since the format was not judged popular enough to justify the extra CD space it would use, that discussion happened on https://launchpad.net/bugs/282294
The issue is pretty much addressed in natty though since file-roller has been built with sessioninstaller support now which means it will ask you if you want to install "p7zip" when you try open an archive using that format: https://launchpad.net/ubuntu/+source/file-roller/2.32.1-0ubuntu2
The other suggestion made there was to add .7z support to the gvfs archive backend, gvfs is using libarchive though which has been designed to work on streams format and 7zip is not in that category so it doesn't seem likely that will happen. You can read http://code.google.com/p/libarchive/issues/detail?id=41 which is the upstream libarchive ticket about the issue
In summary it seems that the issue is mostly adressed in natty with the new file-roller version.
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elias123
wrote on the 21 Nov 10 at 20:43
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Good idea.
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epictete
wrote on the 23 Nov 10 at 23:05
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You musn't use 7zip to backup on Linux because 7zip doesn't store the owners and permissions!
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epictete
wrote on the 23 Nov 10 at 23:08
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http://en.wikipedia.org/wiki/7z :
"The 7z format does not store UNIX owner/group permissions, and hence can be inappropriate for backup/archival purposes."
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elias123
wrote on the 24 Nov 10 at 00:45
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Epictetus; zip format stores the permissions?
I think 7zip format included in Ubuntu is good to share files with others, in some cases 7z compact with a higher compression ratio than zip.
There are people who install Rar by saying have a higher rate of understanding on Linux, put 7z can increase its use, is the best thing is that it is free unlike the Rar.
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elias123
wrote on the 24 Nov 10 at 00:51
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And looking on is possible to use tar 7z format tar.7z not?
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epictete
wrote on the 24 Nov 10 at 13:29
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http://en.wikipedia.org/wiki/7z :
"A workaround is to convert data to a tar bitstream before compressing with 7z."
Elias123 "to use tar 7z format tar.7z not?"
Yes, because then the 7z compression applies not to the files/repertories but to the tar archive in which the permissions have been stored.
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Otus
wrote on the 25 Nov 10 at 20:26
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Using both tar and 7z is a bit redundant, since both formats handle archiving. It works, but you might as well use tar.xz instead and get similar results.
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elias123
wrote on the 26 Nov 10 at 03:41
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tar.xz supports encryption?
Example AES 256?
It seems that. Xz does not support encryption.
So I still prefer 7z which is mostly used is tested.
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Otus
wrote on the 26 Nov 10 at 09:17
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elias123,
That's a good point. However, for encryption one should probably use gpg. You can use it on the compressed file, in effect creating a .tar.xz.gpg file (although gpg itself can do some compression). A number of ciphers are supported including AES-256 and even asymmetric encryption.
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jorsol
wrote on the 26 Nov 10 at 17:31
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Native file formats in Linux don't support encryption (.tar.gz, .tar.bz2, .tar.xz, .tar.lzma) that bad for some users...
I believe that 7z must be supported out of the box, but we should promote .xz (at least between .gz .bz2)
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elias123
wrote on the 27 Nov 10 at 04:45
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I saw no advantage in xz.
What are they?
I created a file tar.xz it was bigger than the tar.7z.
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agp8x
wrote on the 30 Nov 10 at 21:52
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Archive manager ist supporting 7z.
Just install 'p7zip-full', and there you go with the entry in the "Compress file"-menu called ".tar.7z"
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Yes it is easy to install over already come installed by default is good.
Looking into repositories p7zip is a bit outdated, someone needed to upgrade to the latest version.
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tar.xz is further development of unix traditional archievers. We should pormote it fro use out-of-the-box;
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anyedge
wrote on the 5 Dec 10 at 17:52
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.7z, .zip & .rar are the only formats that allow encryption of compressed files. Only .7z & .rar allow files to be compressed into multiple, split volumes(great if you are trying to upload files on a hosting website). Neither encryption nor split compression is allowed by .xz. Right now, it is an inferior format feature-wise. Since .rar(the version most commonly used) is proprietary(free version has not caught up yet), then .7z is the best bet.
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anyedge
wrote on the 5 Dec 10 at 17:56
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Sorry for double-posting, but I forgot to add .cbz and .exe to the encryption list.
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the archive manager is capable of handling 7zip/lzma once the correct package is installed ;-)
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Kasoroth
wrote on the 12 Dec 10 at 21:03
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Regardless of what the best archive format for various purposes, there is often a need to open archives created and distributed by other people. Since the choice of format is often decided by other people, it seems like the sensible thing is to support as many different formats as possible out of the box.
Sometimes licensing or technical difficulties may prevent this, but as far as I know there are no such obstacles preventing the inclusion of 7zip.
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elias123
wrote on the 13 Dec 10 at 02:11
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Yes I think p7zip should take about a 5 MB or less in the iso image.
Do the developers of Linux distributions do not like the format 7zip because the developer's official 7zip does not have an official version for Linux?
Having to create a package as another p7zip?
If I still think p7zip does a good job.
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Install P7zip to add the 7z support.How much time do you spend for installing it??10-15 sec?
Is that too much time for you?
From the other side:Have considered that 90% don't use the .7z format(they are not as you or me)?
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Solution #5:
Idea #25970: "Archive Manager Install Wizard for Unarchiver of Some Archive Type not Installed"
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