I have a ZIP file (created by Info-ZIP on Linux) and I want to make it as small as possible. I have lots of CPU time to burn on the recompression. I already know advzip, and it managed to reduce the size of my ZIP file by 5%. Is there another tool I should try? I would prefer free tools.

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7zip also can repack zips in more effective way – osgx Jun 22 '11 at 12:35
it seems from the linked page that advzip uses 7zip's implementation of deflate. – Dan D. Jun 22 '11 at 12:39
How do I use 7-zip to do that? 7zr a -mx=9 -tzip ../m7.zip * says Unsupported archive type. Using GUI tools is not acceptable in my situation. – pts Jun 22 '11 at 12:45
You want better compression? Don't use zip. Use a different compression method. – afrazier Jun 30 '11 at 15:27
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Then the answers you have are about as good as you'll get. 7-zip has some advanced tunable options, but I think kzip is your best net overall. – afrazier Jul 13 '11 at 23:18
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7zr is a light version, which should only deal with 7z format. (according to man pages, like this , I'm not with 7zr now to test it)

Try using the 7z instead of 7zr and see if it works.

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There is also KZIP, the Linux version is available from here.

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