Upgrade Ghost installation

upgradeghost.sh

#!/bin/sh
GHOST_PATH=/var/ghost

### Make backup
tar cvzf ghostbackup.tar.gz $GHOST_PATH

### Download last ghost version
wget http://ghost.org/zip/ghost-latest.zip

### Remove core
rm -Rf $GHOST_PATH/core

### Unzip to ghost path
unzip -uo ghost-latest.zip -d $GHOST_PATH

### Install last dependencies
cd $GHOST_PATH
npm install --production

## Restart server and ghost
service ghost restart && service nginx restart