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How can I open a .7z file in Ubuntu?

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You can get 7zip on ubuntu by using following command:

sudo apt-get install p7zip-full
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once you have 7zip installed, you can extract an archive like this:

$ 7z x foo.7z
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I know this is a very noob question, but could you please point me to a reference page where I can understand the meaning of the symbols (e.g. $) and the syntax? Thanks – Sosi Apr 9 '13 at 16:25
@Sosi this means that you are using command line on unix with no root rights. When you open a terminal program on ubuntu you see something like this dk@dk-l:~/Soft$ which is you user name, your host name and the path to the current working directory. This ends with a symbol $ or #. The latter means that you have root rights on the system. You need to read some book about Linux basics – user907860 Jun 30 '14 at 12:34
@caligula thanks! – Sosi Jul 3 '14 at 13:07

Thats the file format for 7zip archives. You can grab the 7zip software from here.

EDIT: If you're new to 7zip/Linux, some useful advice can be found on this page.

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File Roller in GNOME does just fine. It is compatible with p7zip, and will allow you to create 7zip archives just right.

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PeaZip is an awesome (GUI) tool for opening most archives.

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lol o_o................... – nnyby Apr 9 '13 at 22:34

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