diff --git a/sh/core/code.awk b/sh/core/code.awk
index 3305853..ee952f7 100644
--- a/sh/core/code.awk
+++ b/sh/core/code.awk
@@ -136,6 +136,7 @@ current_function = ""
 current_match = ""
 doc = ""
 line = 0
+lint = ""
 module = ""
 
 }
@@ -350,6 +351,11 @@ if (action == "doc") {
 	# TODO rwx_ function
 
 	# TODO unique alias
+	if (current_match == "alias") {
+		if (alias in aliases) {
+			print "dupe: " alias
+		}
+	}
 	# TODO unique command
 	# TODO unique function
 
@@ -377,6 +383,10 @@ if (action == "filter") {
 		print item
 	}
 
+# lint
+} else if (action == "lint") {
+	print lint
+
 # action
 }