Bash reading STDOUT stream in real-time

Question

I have searched for this and expected to find hundreds of solutions yet found none !

I would like to read the STDOUT stream and wait for a specific string to appear,

Answer 1

From this unix.stackexchange answer I got following solution:

cmd_which_streams_new_lines \
| while read -r line; do
  # process your line here
  echo "${line}"

  # when you're done, break the loop (be prepared for messy stderr)
done