Instruction: How to install composer into linux server ( Debian, Centos, Ubuntu ), often used for magento 2, cs-cart, laravel and many more...

# cd /tmp

# curl -sS https://getcomposer.org/installer | php

All settings correct for using Composer

Downloading 1.2.4...

Composer successfully installed to: /tmp/composer.phar

Use it: php composer.phar

Move file to the better place

# mv composer.phar /usr/local/bin/composer

Checking

# whereis composer

composer: /usr/local/bin/composer

DONE