If i type \"composer\" i get the above error message.
I did on my macbook:
curl -sS https://getcomposer.org/installer | php sudo mv composer.phar /us
Well I tried a lot of things but none seemed to be working. But the following process did it right, I can now use composer command in terminal. I'm in mac OS 10.12.1
composer
$ curl -sS https://getcomposer.org/installer | php $ chmod +x composer.phar $ mv composer.phar /usr/local/bin/composer $ composer