Change the order of the variables and add a DIR for the data server.

example.env

@@ -1,16 +1,17 @@
 # Variables for fast-access of production server.
 
-PROD_USER=user
 PROD_HOST=example.com
 PROD_PORT=2222
+PROD_USER=user
 
-PROD_GIT_USER=git
 PROD_GIT_HOST=git.example.com
 PROD_GIT_PORT=8080
+PROD_GIT_USER=git
 
-PROD_DATA_USER=data
 PROD_DATA_HOST=sftp.example.com
 PROD_DATA_PORT=2200
+PROD_DATA_USER=data
+PROD_DATA_DIR=/srv/sftp
 
 PROG="$(basename -- "${BASH_SOURCE[0]}")"
 echo "'$PROG' completed!"