bash - Script that monitors log file quits unexpectedly -

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i've written simple script monitors elasticsearch.log looking specific pattern , sending curl post request.

#!/bin/bash  tail -f -n 0 elasticsearch.log | \ while read -r line     echo "$line" | grep '<pattern>'   if [[ "$?" -eq 0 ]]        curl -x post <url>   fi done

the problem script quits unexpectedly 0 exit status. have idea might reason?


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