@@ -196,9 +196,9 @@ function _config_swift_apache_wsgi {

     # copy apache vhost file and set name and port

     local node_number

     for node_number in ${SWIFT_REPLICAS_SEQ}; do

-        local object_port=$[OBJECT_PORT_BASE + 10 * ($node_number - 1)]

-        local container_port=$[CONTAINER_PORT_BASE + 10 * ($node_number - 1)]

-        local account_port=$[ACCOUNT_PORT_BASE + 10 * ($node_number - 1)]

+        local object_port=$(( OBJECT_PORT_BASE + 10 * (node_number - 1) ))

+        local container_port=$(( CONTAINER_PORT_BASE + 10 * (node_number - 1) ))

+        local account_port=$(( ACCOUNT_PORT_BASE + 10 * (node_number - 1) ))

         sudo cp ${SWIFT_DIR}/examples/apache2/object-server.template $(apache_site_config_for object-server-${node_number})

         sudo sed -e "

@@ -257,7 +257,7 @@ function generate_swift_config_services {

     local bind_port=$3

     local server_type=$4

-    log_facility=$[ node_id - 1 ]

+    log_facility=$(( node_id - 1 ))

     local node_path=${SWIFT_DATA_DIR}/${node_number}

     iniuncomment ${swift_node_config} DEFAULT user