Running a command based on output of previous command

Question

Consider the following command. I want to echo "yes" if grep has output and echo "no" if grep returns no output.

cat myfile | grep "something"

Can I do this without if command?

Answer 1

grep sets its exit code to 0 ("success") if it finds something:

grep something myfile &>/dev/null && echo yes || echo no

Answer 2

Use boolean control operators:

[[ -n $(your command) ]] && echo "yes" || echo "no"