diff --git a/demo/x86-gcc/makefile b/demo/x86-gcc/makefile
index 73ac3e3..e30b42a 100644
--- a/demo/x86-gcc/makefile
+++ b/demo/x86-gcc/makefile
@@ -1,13 +1,15 @@
 all : mkdir out
 
-out : main.o shell_port.o shell.o shell_ext.o shell_cmd_list.o
-	gcc -o build/out -T shell.lds build/main.o build/shell_port.o build/shell.o build/shell_ext.o build/shell_cmd_list.o
+out : main.o shell_port.o shell.o shell_ext.o shell_cmd_list.o shell_companion.o shell_fs.o
+	gcc -o build/out -T shell.lds build/main.o build/shell_port.o \
+	build/shell.o build/shell_ext.o build/shell_cmd_list.o \
+	build/shell_companion.o build/shell_fs.o
 
 main.o : main.c shell_port.h
 	gcc -c main.c -I ./ -I ../../src -o build/main.o
 
-shell_port.o : shell_port.c ../../src/shell.h
-	gcc -c shell_port.c -I ./ -I ../../src -o build/shell_port.o
+shell_port.o : shell_port.c ../../src/shell.h ../../extensions/fs_support/shell_fs.h
+	gcc -c shell_port.c -I ./ -I ../../src -I ../../extensions/fs_support -o build/shell_port.o
 
 shell.o : ../../src/shell.c ../../src/shell.h shell_cfg.h
 	gcc -c ../../src/shell.c -I ./ -I ../../src -o build/shell.o
@@ -18,6 +20,12 @@ shell_ext.o : ../../src/shell_ext.c ../../src/shell_ext.h ../../src/shell.h shel
 shell_cmd_list.o : ../../src/shell_cmd_list.c ../../src/shell.h shell_cfg.h
 	gcc -c ../../src/shell_cmd_list.c -I ./ -I ../../src -o build/shell_cmd_list.o
 
+shell_companion.o : ../../src/shell_companion.c ../../src/shell.h shell_cfg.h
+	gcc -c ../../src/shell_companion.c -I ./ -I ../../src -o build/shell_companion.o
+
+shell_fs.o : ../../extensions/fs_support/shell_fs.c ../../extensions/fs_support/shell_fs.h shell_cfg.h ../../src/shell.h
+	gcc -c ../../extensions/fs_support/shell_fs.c -I ./ -I ../../src -I ../../extensions/fs_support -o build/shell_fs.o
+
 .PHONY : all clean mkdir
 clean :
 	-rm -r build
diff --git a/demo/x86-gcc/shell_cfg.h b/demo/x86-gcc/shell_cfg.h
index 8f8b446..d500d2c 100644
--- a/demo/x86-gcc/shell_cfg.h
+++ b/demo/x86-gcc/shell_cfg.h
@@ -12,6 +12,7 @@
 #ifndef __SHELL_CFG_H__
 #define __SHELL_CFG_H__
 
+#include "stdlib.h"
 
 /**
  * @brief 是否使用默认shell任务while循环，使能宏`SHELL_USING_TASK`后此宏有意义
@@ -27,6 +28,17 @@
  */
 #define     SHELL_USING_CMD_EXPORT      1
 
+/**
+ * @brief 是否使用shell伴生对象
+ *        一些扩展的组件(文件系统支持，日志工具等)需要使用伴生对象
+ */
+#define     SHELL_USING_COMPANION       1
+
+/**
+ * @brief 支持shell尾行模式
+ */
+#define     SHELL_SUPPORT_END_LINE      0
+
 /**
  * @brief 是否在输出命令列表中列出用户
  */
@@ -107,6 +119,18 @@
  */
 #define     SHELL_GET_TICK()            0
 
+/**
+ * @brief shell内存分配
+ *        shell本身不需要此接口，若使用shell伴生对象，需要进行定义
+ */
+#define     SHELL_MALLOC(size)          malloc(size)
+
+/**
+ * @brief shell内存释放
+ *        shell本身不需要此接口，若使用shell伴生对象，需要进行定义
+ */
+#define     SHELL_FREE(obj)             free(obj)
+
 /**
  * @brief 是否显示shell信息
  */
diff --git a/demo/x86-gcc/shell_port.c b/demo/x86-gcc/shell_port.c
index a82ef58..c994889 100644
--- a/demo/x86-gcc/shell_port.c
+++ b/demo/x86-gcc/shell_port.c
@@ -10,10 +10,17 @@
  */
 
 #include "shell.h"
-#include "stdio.h"
+#include "shell_fs.h"
+#include <stdio.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <string.h>
 
 Shell shell;
 char shellBuffer[512];
+ShellFs shellFs;
+char shellPathBuffer[512] = "/";
 
 /**
  * @brief 用户shell写
@@ -41,13 +48,44 @@ signed char userShellRead(char *data)
     return 0;
 }
 
+/**
+ * @brief 列出文件
+ * 
+ * @param path 路径
+ * @param buffer 结果缓冲
+ * @param maxLen 最大缓冲长度
+ * @return size_t 0
+ */
+size_t userShellListDir(char *path, char *buffer, size_t maxLen)
+{
+    DIR *dir;
+    struct dirent *ptr;
+    int i;
+    dir = opendir(path);
+    memset(buffer, 0, maxLen);
+    while((ptr = readdir(dir)) != NULL)
+    {
+        strcat(buffer, ptr->d_name);
+        strcat(buffer, "\t");
+    }
+    closedir(dir);
+    return 0;
+}
+
 /**
  * @brief 用户shell初始化
  * 
  */
 void userShellInit(void)
 {
+    shellFs.getcwd = getcwd;
+    shellFs.chdir = chdir;
+    shellFs.listdir = userShellListDir;
+    shellFsInit(&shellFs, shellPathBuffer, 512);
+
     shell.write = userShellWrite;
     shell.read = userShellRead;
+    shellSetPath(&shell, shellPathBuffer);
     shellInit(&shell, shellBuffer, 512);
+    shellCompanionAdd(&shell, SHELL_COMPANION_ID_FS, &shellFs);
 }
diff --git a/doc/img/fs_support_preview.gif b/doc/img/fs_support_preview.gif
new file mode 100644
index 0000000..df00a47
Binary files /dev/null and b/doc/img/fs_support_preview.gif differ
diff --git a/extensions/fs_support/readme.md b/extensions/fs_support/readme.md
new file mode 100644
index 0000000..9ceacc6
--- /dev/null
+++ b/extensions/fs_support/readme.md
@@ -0,0 +1,52 @@
+# letter shell file system support
+
+![version](https://img.shields.io/badge/version-1.0.0-brightgreen.svg)
+![standard](https://img.shields.io/badge/standard-c99-brightgreen.svg)
+![build](https://img.shields.io/badge/build-2020.08.16-brightgreen.svg)
+![license](https://img.shields.io/badge/license-MIT-brightgreen.svg)
+
+letter shell文件系统支持
+
+![preview](../../doc/img/fs_support_preview.gif)
+
+- [letter shell file system support](#letter-shell-file-system-support)
+  - [简介](#简介)
+  - [使用](#使用)
+
+## 简介
+
+fs_support作为letter shell的插件，用于实现letter shell对常见文件系统操作的支持，比如说cd，ls等命令，fs_support依赖于letter shell的伴生对象功能，并且使用到了内存分配和内存释放，所以请确认已经配置好了letter shell
+
+fs_support并非一个完全实现的letter shell插件，由于文件系统的接口和操作系统以及具体使用的文件系统相关，所以fs_support仅仅通过接入几个基本的接口以实现`cd`，`ls`命令，具体使用时，可能需要根据使用的文件系统接口修改fs_support，letter shell的[demo/x86-gcc](demo/x86-gcc)下有针对linux平台的移植，可以及进行参考
+
+## 使用
+
+1. 声明`ShellFs`对象并申请当前路径数据缓冲区
+
+    ```c
+    ShellFs shellFs;
+    char shellPathBuffer[512] = "/";
+    ```
+
+2. 实现`getcwd`，`chdir`，`listdir`函数
+
+    根据文件系统不同，这些函数会有不同的实现，请根据具体使用的环境进行修改
+
+3. 初始化`ShellFs`对象
+
+    ```c
+    shellFs.getcwd = getcwd;
+    shellFs.chdir = chdir;
+    shellFs.listdir = userShellListDir;
+    shellFsInit(&shellFs, shellPathBuffer, 512);
+    ```
+
+4. 初始化`Shell`对象
+
+    设置shell当前路径缓冲，初始化shell，并添加伴生对象
+
+    ```C
+    shellSetPath(&shell, shellPathBuffer);
+    shellInit(&shell, shellBuffer, 512);
+    shellCompanionAdd(&shell, SHELL_COMPANION_ID_FS, &shellFs);
+    ```
diff --git a/extensions/fs_support/shell_fs.c b/extensions/fs_support/shell_fs.c
new file mode 100644
index 0000000..432cc95
--- /dev/null
+++ b/extensions/fs_support/shell_fs.c
@@ -0,0 +1,74 @@
+/**
+ * @file shell_fs.c
+ * @author Letter (nevermindzzt@gmail.com)
+ * @brief shell file system support
+ * @version 0.1
+ * @date 2020-07-22
+ * 
+ * @copyright (c) 2020 Letter
+ * 
+ */
+#include "shell_fs.h"
+#include "shell.h"
+#include "stdio.h"
+
+/**
+ * @brief 改变当前路径(shell调用)
+ * 
+ * @param dir 路径
+ */
+void shellCD(char *dir)
+{
+    Shell *shell = shellGetCurrent();
+    ShellFs *shellFs = shellCompanionGet(shell, SHELL_COMPANION_ID_FS);
+    SHELL_ASSERT(shellFs, return);
+    if (shellFs->chdir(dir) != 0)
+    {
+        shellWriteString(shell, "error: ");
+        shellWriteString(shell, dir);
+        shellWriteString(shell, " is not a directory\r\n");
+    }
+    shellFs->getcwd(shellFs->info.path, shellFs->info.pathLen);
+}
+SHELL_EXPORT_CMD(
+SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_DISABLE_RETURN,
+cd, shellCD, change dir);
+
+/**
+ * @brief 列出文件(shell调用)
+ * 
+ */
+void shellLS(void)
+{
+    size_t count;
+    char *buffer;
+
+    Shell *shell = shellGetCurrent();
+    ShellFs *shellFs = shellCompanionGet(shell, SHELL_COMPANION_ID_FS);
+    SHELL_ASSERT(shellFs, return);
+
+    buffer = SHELL_MALLOC(SHELL_FS_LIST_FILE_BUFFER_MAX);
+    SHELL_ASSERT(buffer, return);
+    count = shellFs->listdir(shellGetPath(shell), buffer, SHELL_FS_LIST_FILE_BUFFER_MAX);
+
+    shellWriteString(shell, buffer);
+
+    SHELL_FREE(buffer);
+}
+SHELL_EXPORT_CMD(
+SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_DISABLE_RETURN,
+ls, shellLS, list all files);
+
+/**
+ * @brief 初始化shell文件系统支持
+ * 
+ * @param shellFs shell文件系统对象
+ * @param pathBuffer shell路径缓冲
+ * @param pathLen 路径缓冲区大小
+ */
+void shellFsInit(ShellFs *shellFs, char *pathBuffer, size_t pathLen)
+{
+    shellFs->info.path = pathBuffer;
+    shellFs->info.pathLen = pathLen;
+    shellFs->getcwd(shellFs->info.path, pathLen);
+}
diff --git a/extensions/fs_support/shell_fs.h b/extensions/fs_support/shell_fs.h
new file mode 100644
index 0000000..522f50e
--- /dev/null
+++ b/extensions/fs_support/shell_fs.h
@@ -0,0 +1,41 @@
+/**
+ * @file shell_fs.h
+ * @author Letter (nevermindzzt@gmail.com)
+ * @brief shell file system support
+ * @version 0.1
+ * @date 2020-07-22
+ * 
+ * @copyright (c) 2020 Letter
+ * 
+ */
+#ifndef __SHELL_FS_H__
+#define __SHELL_FS_H__
+
+#include "stddef.h"
+#include "shell.h"
+
+#define     SHELL_FS_VERSION                "1.0.0"
+
+#define     SHELL_COMPANION_ID_FS           -1
+
+#define     SHELL_FS_LIST_FILE_BUFFER_MAX   4096
+
+/**
+ * @brief shell文件系统支持结构体
+ * 
+ */
+typedef struct shell_fs
+{
+    size_t (*getcwd)(char *, size_t);
+    size_t (*chdir)(char *);
+    size_t (*listdir)(char *dir, char *buffer, size_t maxLen);
+
+    struct {
+        char *path;
+        size_t pathLen;
+    } info;
+} ShellFs;
+
+void shellFsInit(ShellFs *shellFs, char *pathBuffer, size_t pathLen);
+
+#endif