"    Input:  {
              (kernel key) (=xyz)
                 or
              var.(kernel key) (=xyz) 
                               for example, "ck set kernel var.install_to_env" will print install_to_env var
                                            "ck set kernel var.install_to_env=yes" will set install_to_env var to yes
                                            "ck set kernel var.install_to_env=" will set install_to_env var to ""
                                            "ck set kernel" will print all vars
            }

    Output: {
              return       - return code =  0, if successful
                                         >  0, if error
              (error)      - error text if return > 0
            }

"