1# chmod 2 3 4## Command Function 5 6This command is used to change file operation permissions. 7 8 9## Syntax 10 11chmod [_mode_] [_filename_] 12 13 14## Parameters 15 16**Table 1** Parameter description 17 18| Parameter | Description | Value Range | 19| -------- | ------------------------------------------------------------ | -------------- | 20| mode | Specifies the permissions for a file or directory. The value is an octal number, representing the permission of **User** (owner), **Group** (group), or **Others** (other groups).| [0, 777] | 21| filename | Specifies the file path. | An existing file | 22 23 24## Usage Guidelines 25 26- Specify **mode** to change file permissions. 27 28- For the files created on the FAT file system, the file permission attributes are the same as those of the mounted nodes. Currently, the node permissions include only user read and write. The **group** and **others** permissions do not take effect. In addition, only the user read and write permissions can be modified. The read and write permissions are **rw** and **ro** only. There is no such restriction for other file systems. 29 30## Note 31 32Currently, the shell does not support this command. 33 34## Example 35 36Change the permissions on the **hello-openharmony.txt** file to **644** and **777**. 37 38 39## Output 40 41Modify the permissions on the **hello-openharmony.txt** file in the **/dev** directory. 42 43``` 44OHOS:/dev$ chmod 644 hello-openharmony.txt 45OHOS:/dev$ ll hello-openharmony.txt 46-rw-r--r-- 0 0 0 0 1970-01-01 00:00 hello-openharmony.txt 47OHOS:/dev$ chmod 777 hello-openharmony.txt 48OHOS:/dev$ ll hello-openharmony.txt 49-rwxrwxrwx 0 0 0 0 1970-01-01 00:00 hello-openharmony.txt 50``` 51