Use an array for options added to main config file.

net-misc/re6stnet/files/grdn-cfg

@@ -4,7 +4,7 @@
 mountpoint="/media/removable"
 configdir="/home/chronos/user/.re6stconf"
 configfile="${configdir}/re6stnet.conf"
-options=""
+options=()
 
 install -d ${configdir}
 
@@ -18,7 +18,7 @@ fi
 
 read -p "set re6st route as default [Y/n]? " default
 if [ "$default" == "y" -o "$default" == "Y" -o "$default" == "" ] ; then
-    options+="default "
+    options+=('default')
 fi
 
 read -p "save configuration on an external device [Y/n]? " save
@@ -40,11 +40,9 @@ else
     echo "Configuration will be placed in ${configfile}, please do manually backup later or you could lose your access."
 fi
 
-re6st-conf --registry "${registry}" --token "${token}" --dir ${configdir}
+#re6st-conf --registry "${registry}" --token "${token}" --dir ${configdir}
 
-for opt in $options; do
-    echo "$opt" >> ${configfile}
-done
+printf '%s\n' "${options[@]}" >> ${configfile}
 
 echo """
 *filter