diff --git a/README.md b/README.md
index 962aa1a..1c58f7a 100644
--- a/README.md
+++ b/README.md
@@ -553,7 +553,7 @@ Show::table($data, 'a table', $opts);
 
 > 渲染效果请看下面的预览
 
-![table-show](images/table-show.png)
+![table-show](docs/screenshots/table-show.png)
 
 ### 快速的渲染一个帮助信息面板 
 
diff --git a/composer.json b/composer.json
index 260a0f4..1e0cea8 100644
--- a/composer.json
+++ b/composer.json
@@ -26,6 +26,6 @@
     }
   },
   "suggest": {
-    "inhere/simple-print-tool": "Very lightweight data printing tools"
+    "symfony/process": "php process operation"
   }
 }
diff --git a/images/table-show.png b/docs/screenshots/table-show.png
similarity index 100%
rename from images/table-show.png
rename to docs/screenshots/table-show.png
diff --git a/examples/Controllers/HomeController.php b/examples/Controllers/HomeController.php
index 8f64b31..d9581fc 100644
--- a/examples/Controllers/HomeController.php
+++ b/examples/Controllers/HomeController.php
@@ -2,13 +2,14 @@
 
 namespace Inhere\Console\Examples\Controllers;
 
-use Inhere\Console\Components\AnsiCode;
+use Inhere\Console\Components\Terminal;
 use Inhere\Console\Components\ArtFont;
 use Inhere\Console\Components\Download;
 use Inhere\Console\Controller;
 use Inhere\Console\IO\Input;
 use Inhere\Console\Utils\Helper;
 use Inhere\Console\Utils\Interact;
+use Inhere\Console\Utils\ProgressBar;
 use Inhere\Console\Utils\Show;
 
 /**
@@ -157,6 +158,8 @@ public function spinnerCommand()
             Show::spinner();
             usleep(100);
         }
+
+        Show::spinner('Done', true);
     }
 
     /**
@@ -164,16 +167,18 @@ public function spinnerCommand()
      */
     public function pendingCommand()
     {
-        $total = 5000;
+        $total = 8000;
 
         while ($total--) {
-            Show::spinner();
-            usleep(100);
+            Show::pending();
+            usleep(200);
         }
+
+        Show::pending('Done', true);
     }
 
     /**
-     * a progress bar example show
+     * a progress bar example show, by Show::progressBar()
      * @options
      *  --type      the progress type, allow: bar,txt. <cyan>txt</cyan>
      *  --done-char the done show char. <info>=</info>
@@ -212,6 +217,26 @@ public function progressCommand($input)
         return 0;
     }
 
+    /**
+     * a progress bar example show, by class ProgressBar
+     * @throws \LogicException
+     */
+    public function prgCommand()
+    {
+        $i = 0;
+        $total = 120;
+        $bar = new ProgressBar();
+        $bar->start(120);
+
+        while ($i <= $total) {
+            $bar->advance();
+            usleep(50000);
+            $i++;
+        }
+
+        $bar->finish();
+    }
+
     /**
      * output format message: title
      */
@@ -592,39 +617,36 @@ public function downCommand()
     }
 
     /**
-     * This is a demo for show cursor move on the screen
+     * This is a demo for show cursor move on the Terminal screen
      */
     public function cursorCommand()
     {
         $this->write('hello, this in ' . __METHOD__);
-
-        // $this->output->panel($_SERVER, 'Server information', '');
-
         $this->write('this is a message text.', false);
 
         sleep(1);
-        AnsiCode::make()->cursor(AnsiCode::CURSOR_BACKWARD, 6);
+        Terminal::make()->cursor(Terminal::CURSOR_BACKWARD, 6);
 
         sleep(1);
-        AnsiCode::make()->cursor(AnsiCode::CURSOR_FORWARD, 3);
+        Terminal::make()->cursor(Terminal::CURSOR_FORWARD, 3);
 
         sleep(1);
-        AnsiCode::make()->cursor(AnsiCode::CURSOR_BACKWARD, 2);
+        Terminal::make()->cursor(Terminal::CURSOR_BACKWARD, 2);
 
         sleep(2);
 
-        AnsiCode::make()->screen(AnsiCode::CLEAR_LINE, 3);
+        Terminal::make()->screen(Terminal::CLEAR_LINE, 3);
 
         $this->write('after 2s scroll down 3 row.');
 
         sleep(2);
 
-        AnsiCode::make()->screen(AnsiCode::SCROLL_DOWN, 3);
+        Terminal::make()->screen(Terminal::SCROLL_DOWN, 3);
 
         $this->write('after 3s clear screen.');
 
         sleep(3);
 
-        AnsiCode::make()->screen(AnsiCode::CLEAR);
+        Terminal::make()->screen(Terminal::CLEAR);
     }
 }
diff --git a/examples/Controllers/ProcessController.php b/examples/Controllers/ProcessController.php
new file mode 100644
index 0000000..7639fcd
--- /dev/null
+++ b/examples/Controllers/ProcessController.php
@@ -0,0 +1,22 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: inhere
+ * Date: 2017-12-22
+ * Time: 11:44
+ */
+
+namespace Inhere\Console\Examples\Controllers;
+
+use Inhere\Console\Controller;
+
+/**
+ * Class ProcessController
+ * @package Inhere\Console\Examples\Controllers
+ */
+class ProcessController extends Controller
+{
+    protected static $name = 'process';
+
+    protected static $description = 'Some simple process to create and use examples';
+}
\ No newline at end of file
diff --git a/examples/routes.php b/examples/routes.php
index 690e3dc..3d27d91 100644
--- a/examples/routes.php
+++ b/examples/routes.php
@@ -4,47 +4,34 @@
  * User: inhere
  * Date: 2016/12/7
  * Time: 12:46
- *
  * @var Inhere\Console\Application $app
  */
 
 use Inhere\Console\BuiltIn\PharController;
 use Inhere\Console\Examples\Commands\DemoCommand;
-use Inhere\Console\Examples\Controllers\HomeController;
 use Inhere\Console\Examples\Commands\TestCommand;
+use Inhere\Console\Examples\Controllers\HomeController;
+use Inhere\Console\Examples\Controllers\ProcessController;
 use Inhere\Console\IO\Input;
 use Inhere\Console\IO\Output;
-use Inhere\Console\Utils\ProgressBar;
 
 $app->command(DemoCommand::class);
 $app->command('exam', function (Input $in, Output $out) {
     $cmd = $in->getCommand();
 
     $out->info('hello, this is a test command: ' . $cmd);
-});
+}, 'a description message');
 
 $app->command('test', TestCommand::class, [
     'aliases' => ['t']
 ]);
 
-$app->command('prg', function () {
-    $i = 0;
-    $total = 120;
-    $bar = new ProgressBar();
-    $bar->start(120);
-
-    while ($i <= $total) {
-        $bar->advance();
-        usleep(50000);
-        $i++;
-    }
-
-    $bar->finish();
-
-}, 'a description message');
+$app->controller(PharController::class);
 
 $app->controller('home', HomeController::class, [
     'aliases' => ['h']
 ]);
 
-$app->controller(PharController::class);
+$app->controller(ProcessController::class, null, [
+    'prc'
+]);
diff --git a/src/Components/Notify/Pending.php b/src/Components/Notify/Pending.php
index 0e393bf..314d3dc 100644
--- a/src/Components/Notify/Pending.php
+++ b/src/Components/Notify/Pending.php
@@ -16,5 +16,6 @@
  */
 class Pending extends NotifyMessage
 {
-
+    /** @var int Speed value. allow 1 - 100 */
+    private $speed = 20;
 }
\ No newline at end of file
diff --git a/src/Components/AnsiCode.php b/src/Components/Terminal.php
similarity index 96%
rename from src/Components/AnsiCode.php
rename to src/Components/Terminal.php
index 33180aa..06a62e6 100644
--- a/src/Components/AnsiCode.php
+++ b/src/Components/Terminal.php
@@ -11,14 +11,14 @@
 use Inhere\Console\Utils\Show;
 
 /**
- * Class AnsiCode terminal
+ * Class Terminal - terminal control by ansiCode
  * @package Inhere\Console\Components
  *
  * 2K 清除本行
  * \x0D = \r = 13 回车，回到行首
  * ESC = \x1B = 27
  */
-final class AnsiCode
+final class Terminal
 {
     const BEGIN_CHAR = "\033[";
 
@@ -133,8 +133,8 @@ public static function make()
      * build ansi code string
      *
      * ```
-     * AnsiCode::build(null, 'u');  // "\033[s" Saves the current cursor position
-     * AnsiCode::build(0);          // "\033[0m" Build end char, Resets any ANSI format
+     * Terminal::build(null, 'u');  // "\033[s" Saves the current cursor position
+     * Terminal::build(0);          // "\033[0m" Build end char, Resets any ANSI format
      * ```
      *
      * @param mixed $format
diff --git a/src/Utils/CliUtil.php b/src/Utils/CliUtil.php
index 6cfb1e8..4cb39f8 100644
--- a/src/Utils/CliUtil.php
+++ b/src/Utils/CliUtil.php
@@ -142,6 +142,62 @@ public static function getTempDir()
         return $tmp;
     }
 
+    /**
+     * get screen size
+     *
+     * ```php
+     * list($width, $height) = Helper::getScreenSize();
+     * ```
+     * @from Yii2
+     * @param boolean $refresh whether to force checking and not re-use cached size value.
+     * This is useful to detect changing window size while the application is running but may
+     * not get up to date values on every terminal.
+     * @return array|boolean An array of ($width, $height) or false when it was not able to determine size.
+     */
+    public static function getScreenSize($refresh = false)
+    {
+        static $size;
+        if ($size !== null && !$refresh) {
+            return $size;
+        }
+
+        if (self::bashIsAvailable()) {
+            // try stty if available
+            $stty = [];
+
+            if (
+                exec('stty -a 2>&1', $stty) &&
+                preg_match('/rows\s+(\d+);\s*columns\s+(\d+);/mi', implode(' ', $stty), $matches)
+            ) {
+                return ($size = [$matches[2], $matches[1]]);
+            }
+
+            // fallback to tput, which may not be updated on terminal resize
+            if (($width = (int)exec('tput cols 2>&1')) > 0 && ($height = (int)exec('tput lines 2>&1')) > 0) {
+                return ($size = [$width, $height]);
+            }
+
+            // fallback to ENV variables, which may not be updated on terminal resize
+            if (($width = (int)getenv('COLUMNS')) > 0 && ($height = (int)getenv('LINES')) > 0) {
+                return ($size = [$width, $height]);
+            }
+        }
+
+        if (Helper::isOnWindows()) {
+            $output = [];
+            exec('mode con', $output);
+
+            if (isset($output[1]) && strpos($output[1], 'CON') !== false) {
+                return ($size = [
+                    (int)preg_replace('~\D~', '', $output[3]),
+                    (int)preg_replace('~\D~', '', $output[4])
+                ]);
+            }
+        }
+
+        return ($size = false);
+    }
+
     /**
      * @param string $program
      * @return int|string
diff --git a/src/Utils/Helper.php b/src/Utils/Helper.php
index 0daafea..8432c34 100644
--- a/src/Utils/Helper.php
+++ b/src/Utils/Helper.php
@@ -63,6 +63,14 @@ public static function isRoot(): bool
         return getmyuid() === 0;
     }
 
+    /**
+     * @return bool
+     */
+    public static function supportColor()
+    {
+        return self::isSupportColor();
+    }
+
     /**
      * Returns true if STDOUT supports colorization.
      * This code has been copied and adapted from
@@ -382,62 +390,6 @@ public static function spliceKeyValue(array $data, array $opts = [])
         return $text;
     }
 
-    /**
-     * get screen size
-     *
-     * ```php
-     * list($width, $height) = Helper::getScreenSize();
-     * ```
-     * @from Yii2
-     * @param boolean $refresh whether to force checking and not re-use cached size value.
-     * This is useful to detect changing window size while the application is running but may
-     * not get up to date values on every terminal.
-     * @return array|boolean An array of ($width, $height) or false when it was not able to determine size.
-     */
-    public static function getScreenSize($refresh = false)
-    {
-        static $size;
-        if ($size !== null && !$refresh) {
-            return $size;
-        }
-
-        if (CliUtil::bashIsAvailable()) {
-            // try stty if available
-            $stty = [];
-
-            if (
-                exec('stty -a 2>&1', $stty) &&
-                preg_match('/rows\s+(\d+);\s*columns\s+(\d+);/mi', implode(' ', $stty), $matches)
-            ) {
-                return ($size = [$matches[2], $matches[1]]);
-            }
-
-            // fallback to tput, which may not be updated on terminal resize
-            if (($width = (int)exec('tput cols 2>&1')) > 0 && ($height = (int)exec('tput lines 2>&1')) > 0) {
-                return ($size = [$width, $height]);
-            }
-
-            // fallback to ENV variables, which may not be updated on terminal resize
-            if (($width = (int)getenv('COLUMNS')) > 0 && ($height = (int)getenv('LINES')) > 0) {
-                return ($size = [$width, $height]);
-            }
-        }
-
-        if (self::isOnWindows()) {
-            $output = [];
-            exec('mode con', $output);
-
-            if (isset($output[1]) && strpos($output[1], 'CON') !== false) {
-                return ($size = [
-                    (int)preg_replace('~\D~', '', $output[3]),
-                    (int)preg_replace('~\D~', '', $output[4])
-                ]);
-            }
-        }
-
-        return ($size = false);
-    }
-
     /**
      * Word wrap text with indentation to fit the screen size
      *
@@ -465,7 +417,7 @@ public static function wrapText($text, $indent = 0, $width = 0)
         }
 
         if ((int)$width <= 0) {
-            $size = static::getScreenSize();
+            $size = CliUtil::getScreenSize();
 
             if ($size === false || $size[0] <= $indent) {
                 return $text;
diff --git a/src/Utils/ProcessUtil.php b/src/Utils/ProcessUtil.php
index cfb9e1f..cd37131 100644
--- a/src/Utils/ProcessUtil.php
+++ b/src/Utils/ProcessUtil.php
@@ -14,6 +14,14 @@
  */
 class ProcessUtil
 {
+    /**
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return !Helper::isWindows() && \function_exists('pcntl_fork');
+    }
+
     /**
      * Daemon, detach and run in the background
      * @param \Closure|null $beforeQuit
@@ -21,6 +29,10 @@ class ProcessUtil
      */
     public static function daemonRun(\Closure $beforeQuit = null)
     {
+        if (!self::isSupported()) {
+            return 0;
+        }
+
         // umask(0);
         $pid = pcntl_fork();
 
@@ -65,42 +77,74 @@ public static function runInBackground($cmd)
     }
 
     /**
-     * fork multi child processes.
+     * @see ProcessUtil::forks()
      * @param int $number
-     * @param callable|null $childHandler
-     * @return array|int
+     * @param callable|null $onStart
+     * @param callable|null $onError
+     * @return array|false
      */
-    public static function forks($number, callable $childHandler = null)
+    public static function multi(int $number, callable $onStart = null, callable $onError = null)
     {
-        $num = (int)$number > 0 ? (int)$number : 0;
+        return self::forks($number, $onStart, $onError);
+    }
 
-        if ($num <= 0) {
+    /**
+     * fork/create multi child processes.
+     * @param int $number
+     * @param callable|null $onStart Will running on the child processes.
+     * @param callable|null $onError
+     * @return array|false
+     */
+    public static function forks(int $number, callable $onStart = null, callable $onError = null)
+    {
+        if ($number <= 0) {
+            return false;
+        }
+
+        if (!self::isSupported()) {
             return false;
         }
 
         $pidAry = [];
 
-        for ($id = 0; $id < $num; $id++) {
-            $child = self::fork($id, $childHandler);
-            $pidAry[$child['pid']] = $child;
+        for ($id = 0; $id < $number; $id++) {
+            $info = self::fork($onStart, $onError, $id);
+            $pidAry[$info['pid']] = $info;
         }
 
         return $pidAry;
     }
 
     /**
-     * fork a child process.
+     * @see ProcessUtil::fork()
      * @param int $id
-     * @param callable|null $childHandler
-     * param bool $first
-     * @return array
+     * @param callable|null $onStart
+     * @param callable|null $onError
+     * @return array|false
+     */
+    public static function create($id = 0, callable $onStart = null, callable $onError = null)
+    {
+        return self::fork($id, $onStart, $onError);
+    }
+
+    /**
+     * fork/create a child process.
+     * @param callable|null $onStart Will running on the child process start.
+     * @param int $id The process index number. will use `forks()`
+     * @param callable|null $onError
+     * @return array|false
      */
-    public static function fork($id = 0, callable $childHandler = null)
+    public static function fork(callable $onStart = null, callable $onError = null, $id = 0)
     {
+        if (!self::isSupported()) {
+            return false;
+        }
+
         $info = [];
         $pid = pcntl_fork();
 
-        if ($pid > 0) {// at parent, get forked child info
+        // at parent, get forked child info
+        if ($pid > 0) {
             $info = [
                 'id' => $id,
                 'pid' => $pid,
@@ -109,11 +153,14 @@ public static function fork($id = 0, callable $childHandler = null)
         } elseif ($pid === 0) { // at child
             $pid = getmypid();
 
-            if ($childHandler) {
-                $childHandler($id, $pid);
+            if ($onStart) {
+                $onStart($id, $pid);
             }
-
         } else {
+            if ($onError) {
+                $onError($pid);
+            }
+
             Show::error('Fork child process failed! exiting.');
         }
 
@@ -127,6 +174,10 @@ public static function fork($id = 0, callable $childHandler = null)
      */
     public static function wait(callable $onExit)
     {
+        if (!self::isSupported()) {
+            return false;
+        }
+
         $status = null;
 
         //pid<0：子进程都没了
@@ -171,6 +222,10 @@ public static function stopChildren(array $children, $signal = SIGTERM, array $e
             return false;
         }
 
+        if (!self::isSupported()) {
+            return false;
+        }
+
         $events = array_merge([
             'beforeStops' => null,
             'beforeStop' => null,
@@ -273,6 +328,29 @@ public static function killByName($name, $sigNo = 9)
         return exec($cmd);
     }
 
+
+    /**
+     * @param int $pid
+     * @return bool
+     */
+    public static function isRunning($pid)
+    {
+        return ($pid > 0) && @posix_kill($pid, 0);
+    }
+
+    /**
+     * exit
+     * @param int $code
+     */
+    public static function quit($code = 0)
+    {
+        exit((int)$code);
+    }
+
+    /**************************************************************************************
+     * process signal handle
+     *************************************************************************************/
+
     /**
      * send signal to the process
      * @param int $pid
@@ -286,6 +364,10 @@ public static function sendSignal($pid, $signal, $timeout = 0)
             return false;
         }
 
+        if (!self::isSupported()) {
+            return false;
+        }
+
         // do send
         if ($ret = posix_kill($pid, $signal)) {
             return true;
@@ -322,21 +404,24 @@ public static function sendSignal($pid, $signal, $timeout = 0)
     }
 
     /**
-     * @param int $pid
+     * install signal
+     * @param  int $signal e.g: SIGTERM SIGINT(Ctrl+C) SIGUSR1 SIGUSR2 SIGHUP
+     * @param  callable $handler
      * @return bool
      */
-    public static function isRunning($pid)
+    public static function installSignal($signal, callable $handler)
     {
-        return ($pid > 0) && @posix_kill($pid, 0);
+        return pcntl_signal($signal, $handler, false);
     }
 
     /**
-     * exit
-     * @param int $code
+     * dispatch signal
+     * @return bool
      */
-    public static function quit($code = 0)
+    public static function dispatchSignal()
     {
-        exit((int)$code);
+        // receive and dispatch sig
+        return pcntl_signal_dispatch();
     }
 
     /**************************************************************************************
@@ -404,27 +489,6 @@ public static function afterDo($seconds, callable $handler)
         pcntl_alarm($seconds);
     }
 
-    /**
-     * install signal
-     * @param  int $signal e.g: SIGTERM SIGINT(Ctrl+C) SIGUSR1 SIGUSR2 SIGHUP
-     * @param  callable $handler
-     * @return bool
-     */
-    public static function installSignal($signal, callable $handler)
-    {
-        return pcntl_signal($signal, $handler, false);
-    }
-
-    /**
-     * dispatch signal
-     * @return bool
-     */
-    public static function dispatchSignal()
-    {
-        // receive and dispatch sig
-        return pcntl_signal_dispatch();
-    }
-
     /**
      * Set process title.
      * @param string $title
diff --git a/src/Utils/Show.php b/src/Utils/Show.php
index 450b445..a6494ea 100644
--- a/src/Utils/Show.php
+++ b/src/Utils/Show.php
@@ -686,7 +686,7 @@ public static function table(array $data, $title = 'Data Table', array $opts = [
 
         $hasHead = false;
         $rowIndex = 0;
-        $head = $table = [];
+        $head = [];
         $tableHead = $opts['columns'];
         $leftIndent = $opts['leftIndent'];
         $showBorder = $opts['showBorder'];
@@ -814,59 +814,94 @@ public static function table(array $data, $title = 'Data Table', array $opts = [
      ***********************************************************************************/
 
     /**
-     * @todo un-completed
+     * show a spinner icon message
+     * ```php
+     *  $total = 5000;
+     *  while ($total--) {
+     *      Show::spinner();
+     *      usleep(100);
+     *  }
+     *  Show::spinner('Done', true);
+     * ```
+     * @param string $msg
+     * @param bool $ended
      */
-    public static function spinner()
+    public static function spinner($msg = '', $ended = false)
     {
-        static $spinner = 0;
-        static $lastTime = null;
         static $chars = '-\|/';
-        // static $chars = '-.*.-';
+        static $counter = 0;
+        static $lastTime = null;
+
+        $tpl = (Helper::supportColor() ? "\x0D\x1B[2K" : "\x0D\r") . '%s';
+
+        if ($ended) {
+            printf($tpl, $msg);
+
+            return;
+        }
 
-        $tpl = (Helper::isSupportColor() ? "\x0D\x1B[2K" : "\x0D\r") . '%s';
         $now = microtime(true);
 
         if (null === $lastTime || ($lastTime < $now - 0.1)) {
             $lastTime = $now;
-            // echo $chars[$spinner];
-            printf($tpl, $chars[$spinner]);
-            $spinner++;
+            // echo $chars[$counter];
+            printf($tpl, $chars[$counter] . $msg);
+            $counter++;
 
-            if ($spinner > \strlen($chars) - 1) {
-                $spinner = 0;
+            if ($counter > \strlen($chars) - 1) {
+                $counter = 0;
             }
         }
     }
 
     /**
-     * '.'
-     * '..'
-     * '...'
-     * '.'
-     * @param null $msg
+     * alias of the pending()
+     * @param string $msg
+     * @param bool $ended
      */
-    public static function loading($msg = null)
+    public static function loading($msg = 'Loading ', $ended = false)
     {
-
+        self::pending($msg, $ended);
     }
 
-    public static function pending($msg = 'pending')
+    /**
+     * show a pending message
+     * ```php
+     *  $total = 8000;
+     *
+     *  while ($total--) {
+     *      Show::pending();
+     *      usleep(200);
+     *  }
+     *
+     *  Show::pending('Done', true);
+     * ```
+     * @param string $msg
+     * @param bool $ended
+     */
+    public static function pending($msg = 'Pending ', $ended = false)
     {
-        static $spinner = 0;
+        static $counter = 0;
         static $lastTime = null;
-        static $chars = '...';
+        static $chars = ['', '.', '..', '...'];
+
+        $tpl = (Helper::supportColor() ? "\x0D\x1B[2K" : "\x0D\r") . '%s';
+
+        if ($ended) {
+            printf($tpl, $msg);
+
+            return;
+        }
 
-        $tpl = (Helper::isSupportColor() ? "\x0D\x1B[2K" : "\x0D\r") . '%s';
         $now = microtime(true);
 
-        if (null === $lastTime || ($lastTime < $now - 0.1)) {
+        if (null === $lastTime || ($lastTime < $now - 0.8)) {
             $lastTime = $now;
-            // echo $chars[$spinner];
-            printf($tpl, $chars[$spinner]);
-            $spinner++;
+            printf($tpl, $msg . $chars[$counter]);
+            $counter++;
 
-            if ($spinner > \strlen($chars) - 1) {
-                $spinner = 0;
+            if ($counter > \count($chars) - 1) {
+                $counter = 0;
             }
         }
     }