My name is Cristi Burcă.

The Internet calls me scribu.

I work on/with WordPress.

Command Line Learnings
For Make Benefit
Glorious Nation of WordPress

WordCamp Norway 2013

Command Line Interface?

Haven't those gone extinct since the 90's?!

What is WP-CLI?

What is WP-CLI good for?


Task: Set up a cron script that periodically updates everything.


cd /path/to/wp/install

wp db export /tmp/backup.sql

wp core update
wp theme update --all
wp plugin update --all


Task: Access data in a WP install from a Python script.

import subprocess

def get_wp_option(key):
    command = ["wp", "option", "get", key]

    proc = subprocess.Popen(command, stdout=subprocess.PIPE)
    out, err = proc.communicate()

    return out.strip("\n")

print get_wp_option("home")

Long running jobs

Task: Regenerate all thumbnails on a site.


  • send AJAX request for each image
  • 405 LOC


  • simple foreach loop
  • 117 LOC

Interactive debugging

Task: Fool around.

$ wp shell 
Type "exit" to close session.
wp> get_bloginfo('description')
'Just another WordPress site'
wp> strrev($_)
'etis sserPdroW rehtona tsuJ'

Great success!

Code generation

Task: Create a plugin that registers a custom post type and a taxonomy.

wp scaffold plugin wcnorge

wp scaffold post-type slides --plugin=wcnorge

wp scaffold taxonomy slide_cat --post_types=slides --plugin=wcnorge

What about X?

WP-CLI is extensible; it will look for commands defined inside WordPress plugins or themes.

All you have to do is make sure WP-CLI is running:

if ( defined( 'WP_CLI' ) && WP_CLI ) {
    require __DIR__ . '/my-cli-command.php';

More info:


How did WP-CLI get started?

If you can not able do it from command line, is not worth do it.
DevOps Borat