diff --git a/scripts/99_software.sh b/scripts/99_software.sh
index 93c732a..b5c2539 100644
--- a/scripts/99_software.sh
+++ b/scripts/99_software.sh
@@ -25,11 +25,11 @@ parameter=$2
 # ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
 
 param_check() {
-    parameter=$1
-    error_msg=$2
+    _parameter=$1
+    _error_msg=$2
 
-    if [ -z "${parameter}" ] ; then
-        echo "error: ${error_msg}" ; exit 1
+    if [ -z "${p_arameter}" ] ; then
+        echo "error: ${_error_msg}" ; exit 1
     fi
 }
 
@@ -192,7 +192,7 @@ fi
 if [ ${operation} == "services" ] ; then
 
     do_services "common"
-    do_update ${parameter}
+    do_services ${parameter}
 
 fi