diff --git a/chnroutes.py b/chnroutes.py
index 99401a6..bb12dbf 100755
--- a/chnroutes.py
+++ b/chnroutes.py
@@ -157,18 +157,26 @@ def generate_android(metric):
     
     upscript_header=textwrap.dedent("""\
     #!/bin/sh
-    alias nestat='/system/xbin/busybox netstat'
-    alias grep='/system/xbin/busybox grep'
-    alias awk='/system/xbin/busybox awk'
-    alias route='/system/xbin/busybox route'
+    busybox="$(PATH="/system/xbin/busybox:$PATH" which busybox || echo /system/xbin/busybox)"
+    phas(){ type "$@" &>/dev/null; }
+    bhas(){ "$busybox" "$@" &>/dev/null; }
     
-    OLDGW=`netstat -rn | grep ^0\.0\.0\.0 | awk '{print $2}'`
+    phas netstat || alias nestat='"$busybox" netstat'
+    phas grep || alias grep='"$busybox" grep'
+    phsa route || alias route='"$busybox" route'
+    
+    read _ OLDGW _ << EOF
+    $(netstat -rn | grep ^0\.0\.0\.0)
+    EOF
     
     """)
     
     downscript_header=textwrap.dedent("""\
     #!/bin/sh
-    alias route='/system/xbin/busybox route'
+    busybox="$(PATH="/system/xbin/busybox:$PATH" which busybox || echo /system/xbin/busybox)"
+    phas(){ type "$@" &>/dev/null; }
+    bhas(){ "$busybox" "$@" &>/dev/null; }
+    phas route || alias route='/system/xbin/busybox route'
     
     """)