$ gras/datadesc/datadesc_usage --write "--log=root.fmt:%m%n"
> Write to file datadesc_usage.out
> ---- Test on integer ----
$ gras/datadesc/datadesc_usage --write "--log=root.fmt:%m%n"
> Write to file datadesc_usage.out
> ---- Test on integer ----
$ gras/datadesc/datadesc_usage --read "--log=root.fmt:%m%n"
> Read from file datadesc_usage.out
> ---- Test on integer ----
$ gras/datadesc/datadesc_usage --read "--log=root.fmt:%m%n"
> Read from file datadesc_usage.out
> ---- Test on integer ----