created script to edit config file

config.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+
+echo -e "\nConfiguration script for CubeSatSim\n"
+ 
+echo -e "Return keeps current value."
+
+echo -e "Current sim.cfg configuration file: \n"
+
+value=`cat sim.cfg`
+
+echo "$value"
+
+echo
+
+set -- $value
+
+#echo $1 $2 $3 $4
+
+echo -e "Input callsign (all capitals): "
+
+read callsign
+
+if [ -z $callsign ] ; then
+
+	callsign="$1"
+	echo $callsign
+fi
+
+echo -e "Input reset count (integer): "
+
+read resets
+
+if [ -z $resets ] ; then
+	resets="$2"
+	echo $resets
+fi
+
+if ! [[ $resets =~ ^[0-9]+$ ]] ; then
+	echo "Error: not an integer!"
+	resets="$2"
+	echo $resets
+fi 
+
+echo -e "Input latitude  (decimal degrees, positive is north): "
+
+read lat 
+
+if [ -z $lat ] ; then
+
+	lat="$3"
+	echo $lat
+fi
+
+if ! [[ $lat =~ ^[+-]?[0-9]+([.][0-9]+)?$ ]] ; then
+
+	echo "Error: not a number!"
+	lat="$3"
+fi 
+
+echo -e "Input longitude (decimal degrees, positive is east): "
+
+read long 
+
+if [ -z $long ] ; then
+
+	long="$4"
+	echo $long
+fi
+
+if ! [[ $long =~ ^[+-]?[0-9]+([.][0-9]+)?$ ]] ; then
+
+	echo "Error: not a number!"
+	long="$4"
+fi 
+
+echo -e "\nCubeSatSim configuraation sim.cfg file updated to: \n"
+
+echo $callsign $resets $lat $long
+
+echo $callsign $resets $lat $long > sim.cfg
+