add echo command. #1076

core/src/main/java/com/taobao/arthas/core/command/BuiltinCommandPack.java

@@ -2,6 +2,7 @@ package com.taobao.arthas.core.command;
 
 import com.taobao.arthas.core.command.basic1000.CatCommand;
 import com.taobao.arthas.core.command.basic1000.ClsCommand;
+import com.taobao.arthas.core.command.basic1000.EchoCommand;
 import com.taobao.arthas.core.command.basic1000.GrepCommand;
 import com.taobao.arthas.core.command.basic1000.HelpCommand;
 import com.taobao.arthas.core.command.basic1000.HistoryCommand;
@@ -100,6 +101,7 @@ public class BuiltinCommandPack implements CommandResolver {
         commands.add(Command.create(LoggerCommand.class));
         commands.add(Command.create(HistoryCommand.class));
         commands.add(Command.create(CatCommand.class));
+        commands.add(Command.create(EchoCommand.class));
         commands.add(Command.create(PwdCommand.class));
         commands.add(Command.create(MBeanCommand.class));
         commands.add(Command.create(GrepCommand.class));

core/src/main/java/com/taobao/arthas/core/command/basic1000/EchoCommand.java

@@ -0,0 +1,36 @@
+package com.taobao.arthas.core.command.basic1000;
+
+import com.taobao.arthas.core.shell.command.AnnotatedCommand;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.middleware.cli.annotations.Argument;
+import com.taobao.middleware.cli.annotations.Description;
+import com.taobao.middleware.cli.annotations.Name;
+import com.taobao.middleware.cli.annotations.Summary;
+
+/**
+ * 
+ * @author hengyunabc
+ *
+ */
+@Name("echo")
+@Summary("write arguments to the standard output")
+public class EchoCommand extends AnnotatedCommand {
+    private String message;
+
+    @Argument(argName = "message", index = 0, required = false)
+    @Description("message")
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    @Override
+    public void process(CommandProcess process) {
+        if (message != null) {
+            process.write(message);
+            process.write("\n");
+        }
+
+        process.end();
+    }
+
+}