sub _run_ReadWrite {
    my ($invocant, $cmd, $input) = @_;

    # declare needed variables and connect to process
    local (*CHILD_IN, *CHILD_OUT, *CHILD_ERR);
    my ($childpid, @outlines, @errlines);
    $childpid = open3(*CHILD_IN, *CHILD_OUT, *CHILD_ERR, $cmd);

    # feed input to process, then close input
    print CHILD_IN $input; close (CHILD_IN);

    # save output and errors, close those channels and the process
    chomp(@outlines = <CHILD_OUT>); close (CHILD_OUT);
    chomp(@errlines = <CHILD_ERR>); close (CHILD_ERR);
    waitpid($childpid, 0);

    # return the result of the call
    return { OUTPUT => \@outlines , ERRORS => \@errlines };
}