# help<a name="EN-US_TOPIC_0000001134006250"></a>

-   [Command Function](#section991211345413)
-   [Syntax](#section19103204016410)
-   [Parameters](#section1533416233432)
-   [Usage](#section4156445417)
-   [Example](#section12776124712417)
-   [Output](#section092662412544)

## Command Function<a name="section991211345413"></a>

This command is used to display all commands in the OS.

## Syntax<a name="section19103204016410"></a>

help

## Parameters<a name="section1533416233432"></a>

None

## Usage<a name="section4156445417"></a>

You can run  **help**  to display all commands in the current OS.

## Example<a name="section12776124712417"></a>

Run  **help**.

## Output<a name="section092662412544"></a>

Viewing all commands in the system

```
OHOS # help
*******************shell commands:*************************

arp           cat           cd            chgrp         chmod         chown         cp            cpup          
date          dhclient      dmesg         dns           format        free          help          hwi           
ifconfig      ipdebug       kill          log           ls            lsfd          memcheck      mkdir         
mount         netstat       oom           partinfo      partition     ping          ping6         pwd           
reset         rm            rmdir         sem           statfs        su            swtmr         sync          
systeminfo    task          telnet        tftp          touch         umount        uname         watch         
writeproc     
```