update doc

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

@@ -1,5 +1,6 @@
 package com.taobao.arthas.core.command.basic1000;
 
+import com.taobao.arthas.core.command.Constants;
 import com.taobao.arthas.core.shell.command.AnnotatedCommand;
 import com.taobao.arthas.core.shell.command.CommandProcess;
 import com.taobao.middleware.cli.annotations.Argument;
@@ -14,6 +15,9 @@ import com.taobao.middleware.cli.annotations.Summary;
  */
 @Name("echo")
 @Summary("write arguments to the standard output")
+@Description("\nExamples:\n" +
+        "  echo 'abc'\n" +
+        Constants.WIKI + Constants.WIKI_HOME + "echo")
 public class EchoCommand extends AnnotatedCommand {
     private String message;
 

core/src/main/java/com/taobao/arthas/core/command/monitor200/PerfCounterCommand.java

@@ -32,7 +32,10 @@ import sun.management.counter.perf.PerfInstrumentation;
  */
 @Name("perfcounter")
 @Summary("Display the perf counter infornation.")
-@Description(Constants.WIKI + Constants.WIKI_HOME + "perf")
+@Description("\nExamples:\n" +
+        "  perfcounter\n" +
+        "  perfcounter -d\n" +
+        Constants.WIKI + Constants.WIKI_HOME + "perfcounter")
 public class PerfCounterCommand extends AnnotatedCommand {
     private static final Logger logger = LoggerFactory.getLogger(PerfCounterCommand.class);
     private static Object perfObject;

site/src/site/sphinx/advanced-use.md

@@ -6,6 +6,7 @@
 
 * help——查看命令帮助信息
 * [cat](cat.md)——打印文件内容，和linux里的cat命令类似
+* [echo](echo.md)--打印参数，和linux里的echo命令类似
 * [grep](grep.md)——匹配查找，和linux里的grep命令类似
 * [tee](tee.md)——复制标准输入到标准输出和指定的文件，和linux里的tee命令类似
 * [pwd](pwd.md)——返回当前的工作目录，和linux命令类似

site/src/site/sphinx/commands.md

@@ -33,6 +33,7 @@
 * [profiler](profiler.md)
 
 * [cat](cat.md)
+* [echo](echo.md)
 * [grep](grep.md)
 * [tee](tee.md)
 * [pwd](pwd.md)

site/src/site/sphinx/echo.md

@@ -0,0 +1,9 @@
+echo
+===
+
+> 打印参数，和linux里的echo命令类似。
+
+
+```bash
+$ echo 'hello'
+```

site/src/site/sphinx/en/advanced-use.md

@@ -6,6 +6,7 @@ Advanced Usage
 * help - display Arthas help
 * cls - clear the screen
 * [cat](cat.md) - Concatenate and print files
+* [echo](echo.md) - write arguments to the standard output
 * [grep](grep.md) - Pattern searcher
 * [tee](tee.md) - Copies standard input to standard output, making a copy in zero or more files.
 * [pwd](pwd.md) - Return working directory name

site/src/site/sphinx/en/commands.md

@@ -33,6 +33,7 @@ All Commands
 * [profiler](profiler.md)
 
 * [cat](cat.md)
+* [echo](echo.md)
 * [grep](grep.md)
 * [tee](tee.md)
 * [pwd](pwd.md)

site/src/site/sphinx/en/echo.md

@@ -0,0 +1,9 @@
+echo
+===
+
+> write arguments to the standard output.
+
+
+```bash
+$ echo 'hello'
+```