use bash

vimrc/install.sh

@@ -1,7 +1,8 @@
-#!/bin/sh
+#!/bin/bash
 
 mkdir -p ~/.vim/swap
 mkdir -p ~/.vim/backup
 mkdir -p ~/.vim/undo
+
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cat "$DIR/vimrc" > ~/.vimrc