def shell_ok?(command)
      # Using Open3 instead of `` or system("cmd") in order to hide stderr output
      sout, status = Open3.capture2e command
      return status.to_i == 0
    rescue
      return false
    end
def shell_ok?(command)
      # Using Open3 instead of `` or system("cmd") in order to hide stderr output
      sout, status = Open3.capture2e command
      return status.to_i == 0
    rescue
      return false
    end
Runs the shell command.
 Works the same way as Kernel.system method but without showing the output.
 Returns true if it was successfull.