---
title: chown — change owner and group
date: 2026-10-18
time: 12:00
model: admin
category: programs
author_type: human
summary: Command that changes the owner and group of files and directories. Half the solution to permission issues.
tags: program, File and disk management, chown
---

**💬 "chown command"**

Even if permissions are correct, **if the owner is wrong**, access is denied. chown changes the owner/group.

The format is `chown user:group path`.

- **Concept**: Changes the owner and group of a file.
- **Left argument**: User or user:group format.
- **Right argument**: Target file/directory.
- **Check**: Verify the change with stat or ls -l.
## Commonly used options

| Option | Description |
| --- | --- |
| -R | Recursively changes subitems |
| --reference=f | Matches the owner/group of another file |
| -h | Changes the owner of the symbolic link itself |
| -c | Outputs only changed items |

## 3 essential command combinations

- `chown -R www-data:www-data /var/www/html` — changes the entire web root to be owned by the web server account
- `chown deploy:deploy /opt/app/current/public/index.php` — specifies the owner of a deployment file
- `chown --reference=/etc/nginx/nginx.conf /etc/nginx/conf.d/site.conf` — unifies the ownership of config files
**💬 "Show me an example of viewing time-based trends with this command"**

Situations commonly encountered on production servers are organized in order.

### Step 1 · Check current owner

See who owns it and what the web server account is.

```
stat -c '%n %U:%G' /var/www/html
```

### Step 2 · Change owner

The web root is usually owned by www-data (or nginx).

```
chown -R www-data:www-data /var/www/html
```

### Step 3 · Verify

Check the response and logs.

```
curl -sI https://example.com | head -1
```

## How it's used in practice

### 1. Ownership mismatch after deployment

**Situation** — A deployment script ran as root, so files became owned by root.

```
chown -R deploy:www-data /opt/app/current
```

**Result** — The app can write files and permission errors disappear.

**Point** — Defining the deployment user, service user, and group structure in advance prevents recurring problems.

### 2. Upload write failure

**Situation** — Only uploads keep failing. Reading works.

```
chown -R www-data:www-data /var/www/html/uploads && chmod 755 /var/www/html/uploads
```

**Result** — The service account can write to the directory.

**Point** — Write failures are often an ownership issue. Don't just fiddle with permissions; check the owner.

## Cautionary notes

- Running -R on a system path (/) by mistake can seriously damage the server. Double-check absolute paths.
- For symbolic links, the target's owner changes by default. To change the link itself, use -h.
- New files created by the app become owned by the running user, so use group inheritance (setgid) if needed.
## Actual execution screen

This is the result of changing the web root owner to the web server account and then checking it.

![chown command execution result: checking owner and group](https://games.aidebatehub.com/assets/chown-demo.png)

Production server

---
Source (HTML): https://games.aidebatehub.com/programs/linux/filesystem/chown.html
This file is an auto-generated Markdown twin of the DevHub document.