http://unix.stackexchange.com/questions/327807/piping-continious-stream-to-grep-as-search-term-for-search-in-a-file/327868?noredirect=1#comment577145_327868

numbers.txt

1 one
2 two 
3 three

so on

printnumbers.sh

#!/bin/bash

COUNT=0
while true; do
    COUNT=$(($COUNT + 1))
    echo "$COUNT"
    sleep 1
done

readfrompipe.sh

#!/bin/bash

while true;
do
    grep -f myfifo numbers.txt awk '{print $2; system("")}'
done