*nice* maillog output

[Jeff Vian]

Craig Tinson wrote:

> ok.. re previous post about "fix"
>
> it doesn't work.. lol
>
> why would:
>
> tail -500 /var/log/maillog | grep -v imapd |grep -v connection |grep 
> -v processing| cut -d" " -f0,3,6,7,8,9,10| grcat conf.craig
>
> work.. but

This one ends the tail output and passes it to grep .... etc

>
> tail -f /var/log/maillog | grep -v imapd |grep -v connection |grep -v 
> processing| cut -d" " -f0,3,6,7,8,9,10| grcat conf.craig
>
> *not* work..

This one never ends the tail output, so it never releases control to the 
following commands. Grep is waiting for the end of the input before it 
gives the output.

>
> but:
>
> tail -f /var/log/maillog | grcat conf.log
>
> work..

Probably grep is waiting for the end of the input so it can finish 
processing, while great does similar to tail.  It just streams the input 
to output.

>
> so it's not a problem with grcat I don't think..
>
> any ideas?
>
Maybe you need to use a temp file as output of the tail, then use a cron 
to run the grep chain and pass it thru great.  Or do as some have 
suggested and use a perl script to do the processing.

> Craig
>
>