From ca5661cb39c8a32b06cd716376c1623a7b753960 Mon Sep 17 00:00:00 2001
From: rupa <rupa@lrrr.us>
Date: Fri, 22 Feb 2013 15:20:08 -0500
Subject: [PATCH] Add warning message if z.sh is executed instead of sourced.

Closes #74
---
 z.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/z.sh b/z.sh
index 4bad37a..1aebd2a 100755
--- a/z.sh
+++ b/z.sh
@@ -21,6 +21,11 @@
 #   * z -t foo  # cd to most recently accessed dir matching foo
 #   * z -l foo  # list all dirs matching foo (by frecency)
 
+case $- in
+ *i*) ;;
+   *) echo 'ERROR: z.sh is meant to be sourced, not directly executed.'
+esac
+
 _z() {
 
  local datafile="${_Z_DATA:-$HOME/.z}"