bash - Checking if output of a command contains a certain string in a shell script

Question

I'm writing a shell script, and I'm trying to check if the output of a command contains a certain string. I'm thinking I probably have to use grep, but I'm not sure how. Does anyone know?

Answer 1

Testing $? is an anti-pattern.

if ./somecommand |?grep -q 'string'; then
  echo "matched"
fi