Update wordpress installations via cron

update_wp.sh

#!/bin/bash

# /etc/crontab
# 0 8	* * *	root update_blogs.sh >> /var/log/update_blogs.log

admin_mail=my@email.com
blogs=`ls -d /var/www/{blog1,blog2,blog3}`

update_wp(){
  blog=$1
  echo "---- Updating $blog..."
  user=`stat -c "%U" $blog`
  output=`sudo -u $user -i -- wp core update           --path=$blog 2>&1 && 
          sudo -u $user -i -- wp core update-db        --path=$blog 2>&1 && 
          sudo -u $user -i -- wp core language update  --path=$blog 2>&1 && 
          sudo -u $user -i -- wp plugin update --all   --path=$blog 2>&1 && 
          sudo -u $user -i -- wp theme  update --all   --path=$blog 2>&1`
  if [ $? != 0 ]; then
    echo $output | mail -s "Error updating blog $blog" $admin_mail
  fi
  echo $output
  echo
}

echo
echo
echo "============== `date` =============="
echo

for blog in $blogs; do
  update_wp $blog
done