From 36f8a990fb3f828388c19bfa4da5ead4656f8180 Mon Sep 17 00:00:00 2001
From: Colin Chartier <colin.n.chartier@gmail.com>
Date: Tue, 2 Jul 2019 21:09:17 -0400
Subject: [PATCH] Better handle missing PROMPT_COMMAND

---
 shell/bash_shell.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/shell/bash_shell.go b/shell/bash_shell.go
index a15a733..f390849 100644
--- a/shell/bash_shell.go
+++ b/shell/bash_shell.go
@@ -40,7 +40,7 @@ func (shell *BashShell) Enter() error {
 source ~/.bashrc
 
 if [ -z "${OLD_PROMPT_COMMAND+x}" ]; then
-  OLD_PROMPT_COMMAND="$PROMPT_COMMAND"
+  OLD_PROMPT_COMMAND="${PROMPT_COMMAND:-true}"
 fi
 if [ -z "${OLD_PS1+x}" ]; then
   OLD_PS1="$PS1"