Re: pb on multiple <pipe> with tail ?

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Hello rmkml,

thanks for your excellent testing and reporting of bugs!

This is a known issue and (mostly) independent of the OS. The problem 
is that grep writes buffered when the output is no tty. This means it 
will wait until the buffer has filled up before it will flush the data. 
In fact it's stdio.h that is doing that.

I am not aware of a proper solution other than (as discussed before) 
implementing a flag to force grep to write line buffered.

cheers
  simon

On 17.07.2004, at 13:40, rmkml wrote:
> and my question is : multiple pipe with tail not work ?
>
> (same pb with freebsd v4.x)
>
> test 1 :
>
>  xtermA :
>  # tail -f /var/log/messages | grep test
>
>  xtermB :
>  # logger test
>
>  ok I view syslog in xtermA :
>  Jul 17 15:35:51 <1.5> dgfly1 root: test
>
>
> test2 :
>
>  xtermA :
>  # tail -f /var/log/messages | grep test | grep root
>
>  xtermB :
>  # logger test
>
>  I don't view syslog in xtermA ?
>
>
> Regards
>
> Rmkml@xxxxxxxxxx
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