Tail -f piped with sed don't work

From: Ragnar Moller \(MA/EAF\) (ragnar.moller@ericsson.com)
Date: Thu Jan 25 2007 - 05:24:01 EST

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I wanted to the output of a log file and clean up a bit in order to
apply another script to the output.

I have a statement with tail -50 which works, but tail -f doesn't.

It also works if I drop the sed filtering at the end.

Have an idea

tail -50 /var/opt/OV/share/log/trapd.log | grep "Error."| sed
's/^.*STI_//p'| sed 's/_.*$//g'
Works

tail -50 /var/opt/OV/share/log/trapd.log | grep "Error."| sed
's/^.*STI_//p'| sed 's/_.*$//g'
No output

Reagrds,

Ragnar Moller
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