Execute the following commands in Terminal:
# Change directories to where the Tomcat startup scripts are located
cd ../bin

# Remove the .bat scripts
rm *.bat

# Execute the Tomcat startup script
./startup.sh

# Check the Tomcat error log for errors
cd ../logs
less catalina.out

# Some have reported having trouble executing the startup scripts because the execute permission has not been set for some reason. You may have to do the following if this is the case:
cd ../bin
chmod 755 *.sh
# or if you want to tighten up the permissions on everything
chmod 750 *