bug#27942: Bug regarding "touch" command

[L A Walsh]

Paul Eggert wrote:
> L A Walsh wrote:
> > "Touching the 'file' associated with stdout"?
>
> Yes, that's it.
>
> > How would I (or someone) use it?
>
> You run "touch -". Whatever file stdout happens to be associated with, 
> gets touched. It's the same idea as "cat -", except with stdout rather 
> than stdin.

The difference between that and updating due to write activity being
mostly that ctime is also written?