@CliCommand(value = PREFIX + "expunge", help = "Empty the trash")
	public void expunge() {
		List<String> argv = new ArrayList<String>();
		argv.add("-expunge");
		run(argv.toArray(new String[0]));
	}
HDFS shell commands

@author Jarred Li
@author Glenn Renfro
spring-xd-shell/src/main/java/org/springframework/xd/shell/hadoop/FsShellCommands.java