add du command

bindings/java/src/net/hyperic/sigar/cmd/Du.java

@@ -0,0 +1,36 @@
+package net.hyperic.sigar.cmd;
+
+import net.hyperic.sigar.DirUsage;
+import net.hyperic.sigar.SigarException;
+
+/**
+ * Display usage for a directory recursively
+ */
+public class Du extends SigarCommandBase {
+
+    public Du(Shell shell) {
+        super(shell);
+    }
+
+    public Du() {
+        super();
+    }
+
+    public String getUsageShort() {
+        return "Display usage for a directory recursively";
+    }
+
+    protected boolean validateArgs(String[] args) {
+        return args.length == 1;
+    }
+
+    public void output(String[] args) throws SigarException {
+        String dir = args[0];
+        DirUsage du = this.sigar.getDirUsage(dir);
+        println(du.getDiskUsage() + "\t" + dir);
+    }
+
+    public static void main(String[] args) throws Exception {
+        new Du().processCommand(args);
+    }
+}

bindings/java/src/net/hyperic/sigar/cmd/Shell.java

@@ -60,6 +60,7 @@ public class Shell extends ShellBase {
 
     public void registerCommands() throws ShellCommandInitException {
         registerCommandHandler("df", new Df(this));
+        registerCommandHandler("du", new Du(this));
         registerCommandHandler("iostat", new Iostat(this));
         registerCommandHandler("free", new Free(this));
         registerCommandHandler("pargs", new ShowArgs(this));