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
this wasted me a day or two. like why dont anybody say on tutorials that the command composer is not to be used without actually linking and stuff... I mean everyone is writing composer command like its the next step when we are not all 5 years experienced users to know these details.
cp composer.phar /usr/local/bin/composer
did it for me on ubuntu after getting stuck for 2 days