# How do I set permissions on all directories and files on a Linux system?

To change all the directories to 755 (`drwxr-xr-x`):

```bash
find /opt/lampp/htdocs -type d -exec chmod 755 {} \;
```

To change all the files to 644 (`-rw-r--r--`):

```bash
find /opt/lampp/htdocs -type f -exec chmod 644 {} \;
```