chown & chgrp

These commands are used to manage file ownership.

Very common in:

1. Linux administration
2. DevOps
3. Web servers
4. Docker/Kubernetes

1. chown

chown means:

change owner

Used to change:

• file owner
• file owner + group

Check current owner

ls -l

Example:

• rw-r--r-- aryan developers file.txt

Here:

• owner = aryan
• group = developers

Change owner

sudo chown devuser file.txt

Now:

devuser

becomes owner.

Change owner and group together

sudo chown devuser:docker file.txt

Meaning:

• owner = devuser
• group = docker

Change directory ownership

sudo chown devuser project/

Recursive change

Change all files inside folder:

sudo chown -R devuser:developers /opt/app

• R = recursive

Very common in production.

Real Example

Web app files:

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

Used by web servers.

2. chgrp

chgrp means:

change group

Changes only group.

Syntax

sudo chgrp developers file.txt

Owner stays same.

Group changes.

Example

Before:

aryan docker file.txt

Run:

sudo chgrp developers file.txt

After:

aryan developers file.txt

Recursive group change

sudo chgrp -R developers project/

Best Practices

1. Use -R carefully
2. Check ownership with ls -l
3. Use groups for shared access
4. Avoid wrong ownership on system files