From 44b5736d23aa544ea4ac1c9feadd4724b18102be Mon Sep 17 00:00:00 2001
From: Chmouel Boudjnah <chmouel@chmouel.com>
Date: Tue, 7 Feb 2012 18:13:44 +0100
Subject: [PATCH] Check if screen is installed before using it.

Fixes 928377

Change-Id: Ie34860e6d08a457dd52a6c3106d63b54c284f6f3
---
 stack.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stack.sh b/stack.sh
index c40b24c996..093d5d83b3 100755
--- a/stack.sh
+++ b/stack.sh
@@ -90,7 +90,7 @@ source ./stackrc
 DEST=${DEST:-/opt/stack}
 
 # Check to see if we are already running a stack.sh
-if screen -ls | egrep -q "[0-9].stack"; then
+if type -p screen >/dev/null && screen -ls | egrep -q "[0-9].stack"; then
     echo "You are already running a stack.sh session."
     echo "To rejoin this session type 'screen -x stack'."
     echo "To destroy this session, kill the running screen."