Re: trouble with multiple pipes

[dado <dado@pdi.com>]

Dominik Vogt wrote:

> (snip)

have you tried egrep ?

# tail -f foo | egrep -v "5|4"

> And now I want to remove '4' from the output too:
>
>   # tail -f foo | grep -v 5 | grep -v 4
>   (no output generated, pressed ^C)
>
> But when I terminate 'tail'
>   # killall tail
>   1
>   2
>   3
>   zsh: terminated  tail -f foo |
>   zsh: done        grep -v 5 | grep -v 4
>
> Why doesn't get the output of the first pipe get through to
> the second one? Any ideas how to circumvent this problem?
> Unfortunately I need to filter the output from a running
> daemon in this way, but I'm out of ideas.
>
> The same behaviour occurs on HP-UX 10.20 (not that I think the
> OS matters) or with ksh or bash.
>
> Please respond to me personally, I'm not on the list.
>
> Bye
>
> Dominik ^_^
>
> --
> Dominik Vogt, Hewlett-Packard GmbH, Dept. BVS
> Herrenberger Str.130, 71034 Boeblingen, Germany
> phone: 07031/14-4596, fax: 07031/14-3883, dominik_vogt@hp.com

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