Re: read with redirected stdin

[Roman Perepelitsa <roman.perepelitsa@xxxxxxxxx>]

On Sun, Jan 8, 2023 at 2:30 PM Daniel Shahaf <d.s@xxxxxxxxxxxxxxxxxx> wrote:
>
> Roman Perepelitsa wrote on Sat, Jan 07, 2023 at 18:31:30 +0100:
> > On Sat, Jan 7, 2023 at 6:22 PM Pier Paolo Grassi <pierpaolog@xxxxxxxxx> wrote:
> > >
> > > Thanks, but i don't _always_ redirect stdin.
> >
> > The code will still work (except for the corner case I mentioned).
> >
> > Upon further thinking, the following should work in all cases:
> >
> >     if [[ -n $TTY ]]; then
> >       # There is a terminal. Read from it.
> >       read -k1
> >     else
> >       # There is no terminal. Read from stdin.
> >       read -k1 -u0
> >     fi
>
> Would it be useful to provide a ctermid(3) wrapper in zsh/system?

Where would it be useful? Doesn't $TTY already provide a better alternative?

IIRC, ctermid() always returns "/dev/tty" while $TTY points to the real device.

Roman.