Add which example

examples/which.clj

@@ -0,0 +1,17 @@
+#!/usr/bin/env bb
+
+(require '[clojure.java.io :as io])
+
+(defn where [executable]
+  (let [path (System/getenv "PATH")
+        paths (.split path (System/getProperty "path.separator"))]
+    (loop [paths paths]
+      (when-first [p paths]
+        (let [f (io/file p executable)]
+          (if (and (.isFile f)
+                   (.canExecute f))
+            (.getCanonicalPath f)
+            (recur (rest paths))))))))
+
+(when-let [executable (first *command-line-args*)]
+  (println (where executable)))