diff --git a/shell/cat.sh b/shell/cat.sh
index ace6c27..e6edee4 100755
--- a/shell/cat.sh
+++ b/shell/cat.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # cat for Markdown in my ultralight writing database
 # wherein concatenated filed need a "\n---\n\n" between them.
 
diff --git a/shell/rename.sh b/shell/rename.sh
index 667d7bb..071d55d 100755
--- a/shell/rename.sh
+++ b/shell/rename.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # rename : renames the string descriptor used in numbered series.
 
 # Usage:
diff --git a/shell/tag.sh b/shell/tag.sh
index d6c8687..e9aa4be 100755
--- a/shell/tag.sh
+++ b/shell/tag.sh
@@ -1,2 +1,4 @@
+#!/bin/bash
+
 # just list the files so we can pipe it.
 grep -lE "\+ $@" *md