tail -3f logfile.log | grep "action.*add" | sed -u -e "s/^/'/" -e "s/$/'/" | xargs -L 1 -P 5 bash testscript.sh

tail -3f logfile.log | grep "action.*add"

tail -3f /var/tmp/rabbitmq-tracing/logfile.log | grep "action.*add" | grep add

tail -f file.txt | grep something | grep something | grep something