Customize Gnome Archive Manager 7z commands

StackOverflow https://stackoverflow.com/questions/4411793

  •  08-10-2019
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Question

Archive manager + nautilus is very usefull thing for any work with archives

If you install p7zip-full package Archive manager can work with 7z archives

But Archive manager use default settings for compressing

It is very bad

Classical example with javadoc:

Download it from http://www.oracle.com/technetwork/java/javase/downloads/index.html

unzip jdk-6u23-docs.zip
mv docs javadoc

7z a -t7z -m0=lzma -ms=on javadoc.7z javadoc
du -chb javadoc.7z
    24791075    javadoc.7z

But from man 7z and from LzmaLib.h we know that best compression is -mx=9 -mfb=273 -md=64m

Let's try:

7z a -t7z -m0=lzma -mx=9 -mfb=273 -md=64m -ms=on javadoc.7z javadoc
du -chb javadoc.7z
    21308619    javadoc.7z

This is real better!

Question: How to make Archive manager to use custom 7z command as default?

Was it helpful?

Solution

You'll get a faster answer at superuser, for questions like this one.

Looking at the program, I discovered that it was File-Roller and the compression parameters were in an XML file. The manual mentioned nothing about configuration for the compression level. Finally, I found this information with Google(at bottom of page):

Veikk0 wrote on the 24 Jul 10 at 20:17
In my opinion this should get more attention. Creating archives can be frustrating and difficult at the moment, mostly because to change the compression level you have to:

  1. Open gconf-editor (alt+F2 or from terminal).

  2. Navigate to /apps/file-roller/general

  3. Manually edit the key called compression_level to very_fast, fast, normal or maximum.

  4. Create your archive with file-roller.

  5. Repeat if you want to create another archive with different compression level.

Furthermore, there's a bug for this: Bug 450019 - compression level

OTHER TIPS

On Trisquel 6.0/Ubuntu 12.04, it's dconf-editor, and the schema is org.gnome.FileRoller.General.

The best compression with 7-zip can be achieved with

7zr a -mx=9 OUTPUT.7z INPUT

which produces slightly smaller files than the "maximum" compression level of File Roller, due to the fact, that File Roller uses the -m0=lzma2 parameter, which is no longer beneficial as of 7-zip version 9.20.

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