Merge with upstream.

tools/check_for_upgrade.sh

@@ -16,7 +16,7 @@ then
     _update_zsh_update && return 0;
   fi
 
-  epoch_diff=$((${_current_epoch} - $LAST_EPOCH))
+  epoch_diff=$(($(_current_epoch) - $LAST_EPOCH))
   if [ $epoch_diff -gt 6 ]
   then
     echo "[Oh My Zsh] Would you like to check for updates?"
@@ -25,10 +25,11 @@ then
     if [ "$line" = Y ] || [ "$line" = y ]
     then
       /bin/sh $ZSH/tools/upgrade.sh
+      # update the zsh file
+      _update_zsh_update
     fi
   fi
+else
+  # create the zsh file
+  _update_zsh_update
 fi
-
-# update the zsh file
-_update_zsh_update
-

tools/install.sh

@@ -22,7 +22,7 @@ echo "Copying your current PATH and adding it to the end of ~/.zshrc for you."
 echo "export PATH=$PATH" >> ~/.zshrc
 
 echo "Time to change your default shell to zsh!"
-chsh -s "/usr/bin/env zsh"
+chsh -s `which zsh`
 
 echo '         __                                     __  '
 echo '  ____  / /_     ____ ___  __  __   ____  _____/ /_ '