A simple Ruby script to make a shell command that can be executed to install the gems *you* have installed in *their* environment

gem_to_command.rb

#!/usr/bin/env ruby


### gem_to_command.rb ###############################################################
# Produce a command to install the gems you currently have installed (using gem list)
# Makes a simple Shell script that can be run on Linux or Mac OS X
# 
# Author: @sudojosh
######################################################################################

gems = `gem list`
File.open("install_gems.sh", "wb") do |script|
  script << "#!/usr/bin/env ruby\n"
  gems = gems.split("\n").map { |gem| 
    gem = gem.split(' ').map { |part| 
      part.gsub(/[^\w\.\-]/, '') 
    }; 
    [gem[0], gem[1..-1].min] 

  }
  gems.each { |gem|
    script << "gem install #{gem[0]} -v=#{gem[1]}"
    script << " && " unless gem[0] == gems.last[0]
  }
end
puts "Wrote install_gems.sh"