Composer Installieren unter Debian

nano composer-installer.sh

#!/bin/sh
EXPECTED_SIGNATURE=$(wget -q -O - https://composer.github.io/installer.sig)
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
ACTUAL_SIGNATURE=$(php -r "echo hash_file('SHA384', 'composer-setup.php');"
if [ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]
then
>&2 echo 'ERROR: Invalid installer signature'
rm composer-setup.php
exit
fi
php composer-setup.php --quiet
RESULT=$?
rm composer-setup.php

sh composer-installer.sh