YARN commands are invoked by the bin/yarn script.
Apache Hadoop 2.9.0 – YARN Commands http://hadoop.apache.org/docs/stable/hadoop-yarn/hadoop-yarn-site/YarnCommands.html
Apache Hadoop 2.9.0 – YARN Commands http://hadoop.apache.org/docs/stable/hadoop-yarn/hadoop-yarn-site/YarnCommands.html