diff --git a/hacking/env-setup b/hacking/env-setup
index f7ad6a523d..963333113b 100755
--- a/hacking/env-setup
+++ b/hacking/env-setup
@@ -1,4 +1,3 @@
-#!/bin/bash
 # usage: source env-setup [-q]
 #        source hacking/env-setup [-q]
 #        . ./env-setup [-q]
@@ -7,28 +6,37 @@
 
 # When run using source as directed, $0 gets set to bash, so we must use $BASH_SOURCE
 case "$0" in
-    (*bash)
-        HACKING_DIR=${BASH_SOURCE%/*};;
+    (bash)
+        HACKING_DIR="${BASH_SOURCE%/*}";;
     (*)
-        HACKING_DIR=${0%/*};;
+        HACKING_DIR="${0%/*}";;
 esac
 # The below is an alternative to readlink -fn which doesn't exist on OS X
 # Source: http://stackoverflow.com/a/1678636
-FULL_PATH=`python -c "import os; print(os.path.realpath('$HACKING_DIR'))"`
-ANSIBLE_HOME=`dirname "$FULL_PATH"`
+FULL_PATH=$(python -c "import os; print(os.path.realpath('$HACKING_DIR'))")
+ANSIBLE_HOME="${FULL_PATH%/*}"
 
 PREFIX_PYTHONPATH="$ANSIBLE_HOME/lib"
 PREFIX_PATH="$ANSIBLE_HOME/bin"
 PREFIX_MANPATH="$ANSIBLE_HOME/docs/man"
 
-[[ $PYTHONPATH != ${PREFIX_PYTHONPATH}* ]] && export PYTHONPATH=$PREFIX_PYTHONPATH:$PYTHONPATH
-[[ $PATH != ${PREFIX_PATH}* ]] && export PATH=$PREFIX_PATH:$PATH
+case "$PYTHONPATH" in
+  (*${PREFIX_PYTHONPATH}*) :;;
+  (*) export PYTHONPATH="$PREFIX_PYTHONPATH${PYTHONPATH:+:$PYTHONPATH}";;
+esac
+case "$MANPATH" in
+  (*${PREFIX_MANPATH}*) :;;
+  (*) export MANPATH="$PREFIX_MANPATH${MANPATH:+:$MANPATH}";;
+esac
+case "$PATH" in
+  (*${PREFIX_PATH}*) :;;
+  (*) export PATH="$PREFIX_PATH${PATH:+:$PATH}";;
+esac
 export ANSIBLE_LIBRARY="$ANSIBLE_HOME/library"
-[[ $MANPATH != ${PREFIX_MANPATH}* ]] && export MANPATH=$PREFIX_MANPATH:$MANPATH
 
 # Print out values unless -q is set
 
-if [ $# -eq 0 -o "$1" != "-q" ] ; then
+if [ $# -eq 0 ] || [ "$1" != "-q" ] ; then
     echo ""
     echo "Setting up Ansible to run out of checkout..."
     echo ""
@@ -37,7 +45,7 @@ if [ $# -eq 0 -o "$1" != "-q" ] ; then
     echo "ANSIBLE_LIBRARY=$ANSIBLE_LIBRARY"
     echo "MANPATH=$MANPATH"
     echo ""
-    
+
     echo "Remember, you may wish to specify your host file with -i"
     echo ""
     echo "Done!"