bash echo does not work after grep returns nothing

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I understand that people generally use grep in Linux command prompt (not in a script). I happen to put grep in a script and run into a strange case. If the grep command returns nothing, the next line echo does not work. Below is the script.

grep "abc" /home/testuser/myapp.log
echo "abc"

Is this the normal behavior of grep? If yes, why?



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