Packages are to WP-CLI as plugins are to WordPress: modular additional functionality. There are a couple of ways you can install a WP-CLI package.
Use WP-CLI’s built-in installer
For packages listed in the WP-CLI package index, you can install the package with wp package install (doc).
wp package install runcommand/hook
Installing package runcommand/hook (dev-master)
Updating /home/runcommand/.wp-cli/packages/composer.json to require the package...
Using Composer to install the package...
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Loading composer repositories with package information
Updating dependencies
Resolving dependencies through SAT
Dependency resolution completed in 0.001 seconds
Analyzed 361 packages to resolve dependencies
Analyzed 73 rules to resolve dependencies
- Installing runcommand/hook (dev-master e0c6487)
Writing lock file
Generating autoload files
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Success: Package installed successfully.
Require the package on your local machine
If the package isn’t listed in the WP-CLI package index, you’ll need to download it locally and require it through a WP-CLI config file.
Given a package located in ~/.wp-cli/runcommand-profile with a main loader file command.php, you can edit (or create) ~/.wp-cli/config.yml and include the following require statement:
require:
- runcommand-profile/command.php