Run parallel processes in bash

mrd.sh

rm -rf mrd.log
rm -rf mrd.err

# Anything in round braces is a subshell. By default it runs in foreground as well,
# but if you add "&" at the end - it would run as a sub-process.
(
echo "Waiting for mrd to start."

while true; do
  sleep 1s

  if [ ! -f mrd.log ]; then
    continue
  fi

  if [[ `tail -2 mrd.log` == *"Starting MySQL server"* ]]; then
    break
  fi
done

echo "Waiting for 2 seconds."
sleep 2s

echo "Creating first test database."
mysql --socket=/Volumes/MySQLRAMDisk/mysql.sock -uroot -e "create database test_development; create database test_production;"
echo "Ready to rock!"
) &

mrd > mrd.log 2>mrd.err