diff --git a/arch/arm/shared/prepare_ahwstack.c b/arch/arm/shared/prepare_ahwstack.c
index 73f8174b..6b597821 100644
--- a/arch/arm/shared/prepare_ahwstack.c
+++ b/arch/arm/shared/prepare_ahwstack.c
@@ -15,6 +15,7 @@
 #include <xs_assign.h>
 #include "svc_handle.h"
 #include <board.h>
+#include <shell.h>
 
 #if (defined ( __GNUC__ ) && defined ( __VFP_FP__ ) && !defined(__SOFTFP__))
 #define USE_FPU   1
@@ -403,13 +404,8 @@ void MemFaultHandle(uintptr_t *sp)
       
 }
 
-void ShutdownCpu(void)
-{
-    KPrintf("shutdown...\n");
-    CHECK(0);
-}
-
 __attribute__((weak)) void HwCpuReset(void)
 {
     SCB_AIRCR = SCB_RESET_VALUE;
 }
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0), Reboot, HwCpuReset, reset machine );
\ No newline at end of file
diff --git a/arch/risc-v/shared/prepare_rhwstack.c b/arch/risc-v/shared/prepare_rhwstack.c
index ac2d5837..2d1835ab 100644
--- a/arch/risc-v/shared/prepare_rhwstack.c
+++ b/arch/risc-v/shared/prepare_rhwstack.c
@@ -96,17 +96,6 @@ uint8 KTaskStackSetup(struct TaskDescriptor *task)
     return EOK;
 }
 
-
-void ShutdownCpu()
-{
-    uint32 level;
-    KPrintf("shutdown...\n");
-
-    level = DISABLE_INTERRUPT();
-    while (level)
-        CHECK(0);
-}
-
 #ifdef  TASK_ISOLATION
 void RestoreMstatus(uintptr_t *sp)
 {
diff --git a/board/aiit-riscv64-board/board.c b/board/aiit-riscv64-board/board.c
index c69800df..ac170e5f 100644
--- a/board/aiit-riscv64-board/board.c
+++ b/board/aiit-riscv64-board/board.c
@@ -53,7 +53,6 @@ Modification:
 extern x_base cpu2_boot_flag;
 extern void entry(void);
 extern void SecondaryCpuCStart(void);
-extern void ShutdownCpu(void);
 extern int IoConfigInit(void);
 extern int HwCh438Init(void);
 extern int HwSpiInit(void);
@@ -98,7 +97,7 @@ void Kd233Start(uint32_t mhartid)
 	}
 }
 
-int freq(void)
+int Freq(void)
 {
     uint64 value = 0;
 
@@ -124,7 +123,7 @@ int freq(void)
 
     return 0;
 }
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),freq, freq,  show freq info );
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),Freq, Freq, show frequency information );
 
 #ifdef ARCH_SMP
 extern int EnableHwclintIpi(void);
@@ -218,30 +217,6 @@ void HwCpuReset(void)
     while(RET_TRUE);
 }
 
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),
-                                                reboot, HwCpuReset,  reset machine );
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0), Reboot, HwCpuReset, reset machine );
 
-static void (*pre_shutdown_action)(void *);
-static void *pre_shutdown_action_arg;
-
-void SetPreShutdownAction(void (*func)(void *), void *arg)
-{
-    pre_shutdown_action = func;
-    pre_shutdown_action_arg = arg;
-}
-
-void cmd_shutdown()
-{
-#ifdef FS_VFS
-    SyncOpenedFiles();
-#endif
-
-    if (pre_shutdown_action != NULL)
-        pre_shutdown_action(pre_shutdown_action_arg);
-
-    ShutdownCpu();
-}
-
-
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),
-                                               shutdown,cmd_shutdown,shutdown machine); 
+ 
diff --git a/board/kd233/board.c b/board/kd233/board.c
index 2bc030e6..be0bb2e1 100644
--- a/board/kd233/board.c
+++ b/board/kd233/board.c
@@ -54,7 +54,6 @@ Modification:
 extern x_base cpu2_boot_flag;
 extern void entry(void);
 extern void SecondaryCpuCStart(void);
-extern void ShutdownCpu(void);
 extern int IoConfigInit(void);
 extern int HwSpiInit(void);
 extern int HwI2cInit(void);
@@ -121,7 +120,7 @@ int Freq(void)
 
     return 0;
 }
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),freq, Freq,  show freq info );
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),Freq, Freq, show frequency information );
 
 #ifdef ARCH_SMP
 extern int EnableHwclintIpi(void);
@@ -205,27 +204,6 @@ void HwCpuReset(void)
     while(RET_TRUE);
 }
 
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),
-                                                reboot, HwCpuReset,  reset machine );
-static void (*pre_shutdown_action)(void *);
-static void *pre_shutdown_action_arg;
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),Reboot, HwCpuReset,  reset machine );
 
-void SetPreShutdownAction(void (*func)(void *), void *arg)
-{
-    pre_shutdown_action = func;
-    pre_shutdown_action_arg = arg;
-}
 
-void CmdShutdown()
-{
-#ifdef FS_VFS
-    SyncOpenedFiles();
-#endif
-    if (pre_shutdown_action != NULL)
-        pre_shutdown_action(pre_shutdown_action_arg);
-
-    ShutdownCpu();
-}
-
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),
-                                               shutdown,CmdShutdown,shutdown machine); 
diff --git a/board/maix-go/board.c b/board/maix-go/board.c
index ac89ab79..9d26d1dc 100644
--- a/board/maix-go/board.c
+++ b/board/maix-go/board.c
@@ -51,7 +51,6 @@ Modification:
 extern x_base cpu2_boot_flag;
 extern void entry(void);
 extern void SecondaryCpuCStart(void);
-extern void ShutdownCpu(void);
 extern int IoConfigInit(void);
 extern int HwSpiInit(void);
 extern int HwI2cInit(void);
@@ -117,7 +116,7 @@ int Freq(void)
 
     return 0;
 }
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),freq, Freq,  show freq info );
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),Freq, Freq, show frequency information );
 
 #ifdef ARCH_SMP
 extern int EnableHwclintIpi(void);
@@ -170,27 +169,6 @@ void HwCpuReset(void)
     while(RET_TRUE);
 }
 
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),
-                                                reboot, HwCpuReset,  reset machine );
-static void (*pre_shutdown_action)(void *);
-static void *pre_shutdown_action_arg;
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),Reboot, HwCpuReset,  reset machine );
 
-void SetPreShutdownAction(void (*func)(void *), void *arg)
-{
-    pre_shutdown_action = func;
-    pre_shutdown_action_arg = arg;
-}
-
-void CmdShutdown()
-{
-#ifdef FS_VFS
-    SyncOpenedFiles();
-#endif
-    if (pre_shutdown_action != NULL)
-        pre_shutdown_action(pre_shutdown_action_arg);
-
-    ShutdownCpu();
-}
-
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),
-                                               shutdown,CmdShutdown,shutdown machine); 
+ 
diff --git a/fs/shared/src/iot-vfs.c b/fs/shared/src/iot-vfs.c
index c6c14271..520fb66c 100644
--- a/fs/shared/src/iot-vfs.c
+++ b/fs/shared/src/iot-vfs.c
@@ -1164,7 +1164,7 @@ int VfsInit()
     return 0;
 }
 
-int showfd()
+int ShowFd()
 {
     for (int i = 0; i < FD_MAX - FD_OFFSET; i++) {
         struct FileDescriptor *fdp = fdtable[i];
@@ -1178,4 +1178,4 @@ int showfd()
         KPrintf("%s\n", fdp->path);
     }
 }
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),showfd, showfd,  list file descriptor );
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHELL_CMD_PARAM_NUM(0),ShowFd, ShowFd,  show file descriptor );
diff --git a/tool/shell/letter-shell/shell.c b/tool/shell/letter-shell/shell.c
index 4f3121f7..2cd6e577 100644
--- a/tool/shell/letter-shell/shell.c
+++ b/tool/shell/letter-shell/shell.c
@@ -1545,7 +1545,7 @@ void shellHelp(int argc, char *argv[])
 }
 SHELL_EXPORT_CMD(
 SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN)|SHELL_CMD_DISABLE_RETURN,
-help, shellHelp, show command info\r\nhelp [cmd]);
+Help, shellHelp, show command info\r\nhelp [cmd]);
 
 /**
  * @brief shell Input processing