Look into /usr/share/php5/PEAR/PHP/CodeSniffer/Standards
All sub-folders there can be used as standard name:
phpcs --standard=PEAR test.php
phpcs --standard=Zend test.php
Look into /usr/share/php5/PEAR/PHP/CodeSniffer/Standards
All sub-folders there can be used as standard name:
phpcs --standard=PEAR test.php
phpcs --standard=Zend test.php