4ti2 installation guide for linux machines

Create a directory for 4ti2, call it '4ti2', say. Download the file for linux machines to the new directory '4ti2'. Go to directory '4ti2'. Untar file by 'tar xvfz 4ti2_v1.2_linux_x86.tgz'. Remove tar file by 'rm 44ti2_v1.2_linux_x86.tgz'.