Add a trivial ps command.
diff --git a/busybox.def.h b/busybox.def.h
index 85d3df1..eec6621 100644
--- a/busybox.def.h
+++ b/busybox.def.h
@@ -38,6 +38,7 @@
 #define BB_MT
 #define BB_MV
 //#define BB_PRINTF
+#define BB_PS
 #define BB_PWD
 #define BB_REBOOT
 #define BB_RM