improve selective status update which makes most preset values unnecessary

shared-functions.so

@@ -26,7 +26,12 @@ function wtmp {
       VAR_NAME=${!i} # variable name
       VAR_VAL=${!VAR_NAME}  # value of the variable's name
       
-      sed -Ei "s/^$VAR_NAME=.*/$VAR_NAME=$VAR_VAL/" $TMP
+      if [ $(grep -q "^$VAR_NAME=" $TMP; echo $?) == 0 ] ; then   # variable already exists in status file
+        sed -Ei "s/^$VAR_NAME=.*/$VAR_NAME=$VAR_VAL/" $TMP
+      else
+        echo "$VAR_NAME=$VAR_VAL" >> $TMP
+      fi
+        
     done
   fi