What are other chown options?

Here are some common options you can use with the chown command in Unix-like operating systems:

Change Owner Only:
```
chown username file.txt
```
Changes only the owner of the file to username.
Change Group Only:
```
chown :groupname file.txt
```
Changes only the group of the file to groupname.
Recursive Change:
```
chown -R username:groupname directory/
```
The -R option changes the owner and group of the specified directory and all its contents recursively.
Verbose Output:
```
chown -v username:groupname file.txt
```
The -v option provides a verbose output, showing what changes were made.
Reference File:
```
chown --reference=reference_file.txt target_file.txt
```
This option changes the ownership of target_file.txt to match that of reference_file.txt.

If you have any further questions or need more details, feel free to ask!