improve spider watcher

spider_watcher.sh

@@ -1,12 +1,11 @@
 #!/bin/sh
 ## spider watcher, work with start_cloud_in_container.sh
 
+script_root=$(dirname $0)
+cd $script_root
 
 watcher()
 {
-    # you should change this directory path
-    script_root='~/Develop/machete_hero/'
-
     spider_num=`ps -ef | grep 'node spider.mjs' | grep -v grep | wc -l`
 
     if [ $spider_num -lt 1 ]; then