Batch update WordPress sites using WP-CLI

update_sites.sh

#!/bin/bash

# A bash script to batch update a server's WordPress sites with WP-CLI. It requires WP-CLI, obviously (https://wp-cli.org/).
# The script will search for all WordPress installations under a given directory and will update them. You can declare more than one such directories.
# You don't have to modify the script every time you add a new site. As long as the new site is under a declared parent directory, its database will be backed up.
# After creating the file, don't forget to make it executable by doing:
# chmod +x update_sites.sh

# Set PATH environment variable
export PATH="/usr/local/bin:/usr/bin:/bin"

# The base path on your server (you might need to change that)
BASEPATH=/var/www

# We use a function, in order to be able to call it as many times as we want, for as many different directories containing WordPress installations there are on the server
update_sites() {

	# Iterate over all folders under the given parent directory
	for d in $1/* ; do
	
		# Check if the folder is indeed a WordPress installation by searching for a wp-config.php file
		if [ -f $d/wp-config.php ]; then
			
			echo -e "\e[32mUpdating $d\e[0m"
			
			# Update all plugins
			sudo /usr/local/bin/wp --path="$d/htdocs" --allow-root plugin update --all
		
			# Update core
			sudo /usr/local/bin/wp --path="$d/htdocs" --allow-root core update
			
			# Update database after core update
                        sudo /usr/local/bin/wp --path="$d/htdocs" --allow-root core update-db

			# Update core themes (the ones with their filename starting with "twenty")
			for theme in $(sudo /usr/local/bin/wp --path="$d/htdocs" --allow-root theme list --field=name | grep twenty); 
				do sudo /usr/local/bin/wp --path="$d/htdocs" --allow-root theme update $theme; 
			done
			
		fi

	done

}

# Call the function giving as a parameter the path to the directory containing your WordPress installations (you might need to change that)
update_sites ${BASEPATH}