Use braces

install-freedombone.sh

 USB_DRIVE=/dev/sda1
 
 # memory limit for php in MB
-MAX_PHP_MEMORY="32"
+MAX_PHP_MEMORY=32
 
 export DEBIAN_FRONTEND=noninteractive
 
 }
 
 function configure_php {
-  sed -i "s/memory_limit = 128M/memory_limit = $MAX_PHP_MEMORYM/g" /etc/php5/fpm/php.ini
+  sed -i "s/memory_limit = 128M/memory_limit = ${MAX_PHP_MEMORY}M/g" /etc/php5/fpm/php.ini
   sed -i 's/;cgi.fix_pathinfo=1/cgi.fix_pathinfo=0/g' /etc/php5/fpm/php.ini
-  sed -i "s/memory_limit = -1/memory_limit = $MAX_PHP_MEMORYM/g" /etc/php5/cli/php.ini
+  sed -i "s/memory_limit = -1/memory_limit = ${MAX_PHP_MEMORY}M/g" /etc/php5/cli/php.ini
   sed -i "s/upload_max_filesize = 2M/upload_max_filesize = 50M/g" /etc/php5/fpm/php.ini
   sed -i "s/post_max_size = 8M/post_max_size = 50M/g" /etc/php5/fpm/php.ini
-  sed -i "s/memory_limit = /memory_limit = $MAX_PHP_MEMORYM/g" /etc/php5/cli/php.ini
-  sed -i "s/memory_limit = /memory_limit = $MAX_PHP_MEMORYM/g" /etc/php5/fpm/php.ini
 }
 
 function install_owncloud {