diff --git a/xCAT-web/lib/functions.php b/xCAT-web/lib/functions.php
index b7f54d472..3843f7e05 100644
--- a/xCAT-web/lib/functions.php
+++ b/xCAT-web/lib/functions.php
@@ -873,11 +873,11 @@ function getGroups() {
 
 //-----------------------------------------------------------------------------
 // Returns true if we are running on AIX
-function isAIX() { }     //todo: implement
+function isAIX() { if(exec("oslevel")) {return TRUE;}else {return FALSE;} }     //todo: implement
 
 //-----------------------------------------------------------------------------
 // Returns true if we are running on Linux
-function isLinux() { }     //todo: implement
+function isLinux() { if(exec("uname") == "Linux") {return TRUE;} else {return FALSE;} }     //todo: implement
 
 //-----------------------------------------------------------------------------
 // Returns true if we are running on Windows