run with low priority

tar1090.sh

@@ -4,6 +4,9 @@ set -e
 trap 'echo "[ERROR] Error in line $LINENO when executing: $BASH_COMMAND"' ERR
 trap 'echo tar1090.sh: exiting; trap - SIGTERM; kill -- -$( ps opgid= $$ | tr -d " " ) || true; exit 0' SIGTERM SIGINT SIGHUP SIGQUIT
 
+# run with lowest priority
+renice 20 $$ || true
+
 RUN_DIR=$1
 SRC_DIR=$2