Re: Use of pipe in $(< filename | program) returns null

[DennisW]

On Nov 28, 4:46 am, Andreas Schwab <sch...@linux-m68k.org> wrote:
> Bernd Eggink <mono...@sudrala.de> writes:
> > Am 28.11.2009 06:35, schrieb r...@saturn.syslang.net:
>
> >> Description:
> >>        use of $(<  filename | program) does not work. It either should or 
> >> it should be properly documented.
> >>        The problem also happens on bash4.
>
> >> Repeat-By:
>
> >>        qq=$(<  /etc/passwd | grep sys)
> >>        echo $qq
> >>        # result is null
>
> >> Fix:
> >>        Either fix the docs to tell people that a pipe is not allowed or 
> >> fix the code to allow it.
>
> > The problem is not the pipe but the fact that '<filename' is an empty
> > command which does nothing. If you want 'program' to read from 'file', use
> > program<file'.
>
> Or even $(< /etc/passwd grep sys).
>
> Andreas.
>
> --
> Andreas Schwab, sch...@linux-m68k.org
> GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
> "And now for something completely different."

Or even $(grep sys /etc/passwd)