diff --git a/zsh/functions b/zsh/functions
new file mode 100644
index 00000000..c5ff970e
--- /dev/null
+++ b/zsh/functions
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+function command_exists() {
+    command -v "$1" &> /dev/null;
+}