improve selective status update which makes most preset values unnecessary

config.cfg.sample

@@ -3,10 +3,7 @@ TMP=/tmp/status
 
 # Default values when first starting the tool
 var_conn="on"
-var_mailqueue_runs=9
-var_ip4=127.0.0.1
-var_ip6=::1
-var_vpn="off"
+var_mailqueue_runs=0
 
 # status-ip.sh
 IPSERV4="http://returns.plain-ipv4"

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