$ sudo apt-get update
$ sudo apt-get install ruby-em-socksify 

ruby-em-socksify is installed in your system.

Make ensure the ruby-em-socksify package were installed using the commands given below,

$ sudo dpkg-query -l | grep ruby-em-socksify *

You will get with ruby-em-socksify package name, version, architecture and description in a table

ruby-em-socksify package basic information: