diff --git a/bin/hsadmin-ng b/bin/hsadmin-ng
index 40a0dc4e..50f88b8f 100755
--- a/bin/hsadmin-ng
+++ b/bin/hsadmin-ng
@@ -31,7 +31,6 @@ else
 fi
 
 if [ -z "$HSADMINNG_CAS_LOGIN" ] || [ -z "$HSADMINNG_CAS_VALIDATE" ] || \
-   [ -z "$HSADMINNG_CAS_USERNAME" ] || [ -z "$HSADMINNG_CAS_PASSWORD" ] || \
    [ -z "$HSADMINNG_CAS_SERVICE" ]; then
   cat >&2 <<EOF
   ERROR: environment incomplete
@@ -39,14 +38,23 @@ if [ -z "$HSADMINNG_CAS_LOGIN" ] || [ -z "$HSADMINNG_CAS_VALIDATE" ] || \
   please set the following environment variables:
   export HSADMINNG_CAS_LOGIN=https://login.hostsharing.net/cas/v1/tickets
   export HSADMINNG_CAS_VALIDATE=https://login.hostsharing.net/cas/proxyValidate
-  export HSADMINNG_CAS_USERNAME=<<your username>>
-  export HSADMINNG_CAS_PASSWORD=<<your password>>
+  export HSADMINNG_CAS_USERNAME=<<optionally, your username, or leave empty after '='>>
+  export HSADMINNG_CAS_PASSWORD=<<optionally, your password, or leave empty after '='>>
   export HSADMINNG_CAS_SERVICE=https://hsadminng.hostsharing.net:443/
 EOF
   exit 1
 fi
 
 function casLogin() {
+
+  if [ -z "$HSADMINNG_CAS_USERNAME" ]; then
+    read -p "Username: " HSADMINNG_CAS_USERNAME
+  fi
+
+  if [ -z "$HSADMINNG_CAS_PASSWORD" ]; then
+    read -p "Password: " HSADMINNG_CAS_PASSWORD
+  fi
+
   HSADMINNG_CAS_TGT=`doCurl -s -i -X POST \
         -H 'Content-Type: application/x-www-form-urlencoded' \
         -d "username=$HSADMINNG_CAS_USERNAME&password=$HSADMINNG_CAS_PASSWORD" \