optimized script an make it more robust.

ffs-set-segment/files/usr/sbin/ffs-set-segment

 #!/bin/sh
 ME=$(basename $0)
-if [ $(ps | grep -c "{$(basename $0)}") -gt 4 ]; then
+if [ $(ps | grep -c "$ME") -gt 4 ]; then
   logger -s -t $ME "started twice"
   exit 1
 fi
@@ -15,7 +15,7 @@ fi
 
 NODEID=$(uci get network.bat0.macaddr | sed 's/://g')
 PUBKEY=$(/etc/init.d/fastd show_key mesh_vpn | cut -c1-12)
-SEGINFO=$(nslookup ffs-$NODEID-$PUBKEY.segassign.freifunk-stuttgart.de  [::1]:54 | grep "2001:2:0:711::")
+SEGINFO=$(nslookup ffs-${NODEID}-${PUBKEY}.segassign.freifunk-stuttgart.de  [::1]:54 | grep "2001:2:0:711::")
 if [ -z "$SEGINFO" ]; then
   logger -t $ME "Node not known"
   exit 1
@@ -33,11 +33,11 @@ CHANGED=0
 for i in `seq 1 10`;
 do
   GW=$(printf "gw%02d" $i)
-  OLDPEER=$(uci get fastd.mesh_vpn_backbone_peer_$GW.remote)
-  NEWPEER="\"${GW}s$SEGNUM.gw.freifunk-stuttgart.de\" port $PORT"
+  OLDPEER=$(uci get fastd.mesh_vpn_backbone_peer_${GW}.remote)
+  NEWPEER="\"${GW}s${SEGNUM}.gw.freifunk-stuttgart.de\" port $PORT"
 
   if [ "$NEWPEER" != "$OLDPEER" ]; then
-    uci set fastd.mesh_vpn_backbone_peer_$GW.remote="$NEWPEER"
+    uci set fastd.mesh_vpn_backbone_peer_${GW}.remote="$NEWPEER"
     CHANGED=1
   fi
 done