copy_gems.rb

# copy_gems.rb
# Run on Computer A to generate copy_gems.sh
# Run copy_gems.sh on Computer B to install all gems (including all versions)

list = `sudo gem list --local`
output = "#!/bin/bash\n"
list.each_line do |line| 
  name, ver = line.split(" (")
  ver.gsub(/[\(|\)]/, '').split(', ').each { |v| output << "sudo gem install #{name.chomp} -v #{v.chomp} --no-rdoc --no-ri\n" }
end

File.open("copy_gems.sh", "w") { |f| f.write(output) }