Install 7-Zip Archiver in Ubuntu

7-Zip is a file achiever application which has ability to archives file with very high compression ratios, 7-zip was that originally design for windows but you can use it in Ubuntu now, 7zip also have own achieve format that known as 7z. 

p7zip is the Unix command-line port of 7-Zip, p7zip-full provides utilities to pack and unpack 7z archives within a shell or using a GUI through nautilus. p7zip support following archive format :

Packing / Unpacking : 7z, ZIP, GZIP, BZIP2, XZ and TAR

Unpacking only : APM, ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, LZMA2, MBR, MSI, MSLZ, NSIS, NTFS, RPM, SquashFS, UDF, VHD, WIM, XAR and Z.

Archive using 7-zip via Nautilus

Install 7-Zip in Ubuntu
p7zip is available by default in ubuntu 11.10 Oneiric repository, you can install p7zip in ubuntu trough simply command as following :

sudo apt-get install p7zip-full

7-Zip extension for Ark to extract .rar files, also install:

sudo apt-get install p7zip-rar