From 022af184f16f2bf1a2444a02f351143ca3bb2177 Mon Sep 17 00:00:00 2001
From: Ian Kelling <iank@fsf.org>
Date: Sun, 14 Feb 2021 07:55:02 -0500
Subject: [PATCH] add check for bash shell

---
 err | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/err b/err
index 2755e24..a5d3752 100644
--- a/err
+++ b/err
@@ -36,6 +36,8 @@
 # outside of the subshell. Note, errexit + inherit_errexit doesn't have
 # any smarts around this either.
 
+if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
+
 #######################################
 # err-catch: Setup trap on ERR to print stack trace and exit (or return
 # if the shell is interactive). This is the most common use case so we
-- 
2.25.1