How can I increase command line memory_limit for PHP with MAMP PRO?
Instead of guessing which php.ini you need to alter, run this command to locate the file:

php -r 'phpinfo();' | grep 'php.ini'


Even though I use MAMP PRO, by default my command-line PHP commands are not executed using their copy of PHP. In my case it says the file is found at /etc/php.ini

Once you have located the file, follow the instructions on all of the other answers to bump the memory_limit setting:

memory_limit = 256M