Problem :
7-Zip for Linux, does such a thing exist?
I mean actually 7-Zip or a port, not another compression tool or command.
Solution :
If you use Debian or Ubuntu it is in the standard repositories (http://packages.ubuntu.com/trusty/p7zip), so you can install it with as little as:
aptitude install p7zip
Or for the full version that includes archive creation and other format support (http://packages.ubuntu.com/trusty/p7zip-full):
aptitude install p7zip-full
There are no doubt packages for it in the official repositories for most other distributions too, probably with the same package names.
PeaZip – a Linux 7-Zip port; supports all file formats that 7-Zip supports. The GUI of PeaZip is also nicer than 7-Zip’s.
Website: Peazip.sourceforge.net
Wikipedia article
You can always run 7-Zip in Wine. It runs flawlessly.