This article explains how to install Composer on a CentOS and Redhat system.
curl -sS https://getcomposer.org/installer | php
You should get something like this in return. Note that i have an old version of PHP on this system so it warns me about it:
[root@server ~]# cd ~ [root@server ~]# curl -sS https://getcomposer.org/installer | php #!/usr/bin/env php Some settings on your machine may cause stability issues with Composer. If you encounter issues, try to change the following: Your PHP (5.3.3) is quite old, upgrading to PHP 5.3.4 or higher is recommended. Composer works with 5.3.2+ for most people, but there might be edge case issues. Downloading... Composer successfully installed to: /root/composer.phar Use it: php composer.phar
Finally move it to where you want it:
[root@server ~]# mv composer.phar /usr/local/bin/composer
At this stage you should be fine.