1# help<a name="EN-US_TOPIC_0000001134006250"></a> 2 3- [Command Function](#section991211345413) 4- [Syntax](#section19103204016410) 5- [Parameters](#section1533416233432) 6- [Usage](#section4156445417) 7- [Example](#section12776124712417) 8- [Output](#section092662412544) 9 10## Command Function<a name="section991211345413"></a> 11 12This command is used to display all commands in the OS. 13 14## Syntax<a name="section19103204016410"></a> 15 16help 17 18## Parameters<a name="section1533416233432"></a> 19 20None 21 22## Usage<a name="section4156445417"></a> 23 24You can run **help** to display all commands in the current OS. 25 26## Example<a name="section12776124712417"></a> 27 28Run **help**. 29 30## Output<a name="section092662412544"></a> 31 32Viewing all commands in the system 33 34``` 35OHOS # help 36*******************shell commands:************************* 37 38arp cat cd chgrp chmod chown cp cpup 39date dhclient dmesg dns format free help hwi 40ifconfig ipdebug kill log ls lsfd memcheck mkdir 41mount netstat oom partinfo partition ping ping6 pwd 42reset rm rmdir sem statfs su swtmr sync 43systeminfo task telnet tftp touch umount uname watch 44writeproc 45``` 46 47