stdlib get-env added

stdlib/stdlib.lsp

@@ -37,6 +37,9 @@
 (defun sleep (time) 
   (system-cmd (+ "sleep " (string time))))
 
+(defun get-env (var) 
+    (second (system-cmd (+ "echo ${" var "} | tr -d \"\n\""))))
+
 
 ; return second element of list
 (defun second (l) (index l 1))