Linux chown Command

last modified March 3, 2025

The chown command in Linux is used to change the ownership of files and directories. It allows you to modify the user and group associated with a file or directory. This tutorial covers basic and advanced usage of chown with practical examples.

chown is commonly used for managing file permissions and ensuring proper access control in multi-user environments.

Change File Ownership

This example demonstrates how to change the owner of a file.

chown newowner filename.txt

The chown command changes the owner of filename.txt to newowner.

Change File Ownership and Group

This example shows how to change both the owner and group of a file.

chown newowner:newgroup filename.txt

The chown command changes the owner to newowner and the group to newgroup for filename.txt.

Change Ownership Recursively

This example demonstrates how to change ownership for all files in a directory.

chown -R newowner:newgroup /path/to/directory

The -R option applies the ownership change recursively to all files and subdirectories within /path/to/directory.

Change Group Only

This example shows how to change only the group of a file.

chown :newgroup filename.txt

The chown command changes the group of filename.txt to newgroup without altering the owner.

Change Ownership Using UID and GID

This example demonstrates how to change ownership using user and group IDs.

chown 1001:1002 filename.txt

The chown command changes the owner to the user with UID 1001 and the group to the group with GID 1002.

Preserve Root Ownership

This example shows how to prevent changing ownership of root-owned files.

chown --preserve-root newowner:newgroup /path/to/directory

The --preserve-root option prevents chown from modifying the ownership of the root directory.

Best Practices for chown

• Use with Caution: Changing ownership can affect system security and functionality.
• Recursive Changes: Use -R carefully to avoid unintended modifications.
• Verify Ownership: Use ls -l to check ownership before and after changes.
• Preserve Root: Use --preserve-root to avoid accidental changes to system files.

Source

GNU chown Manual

In this article, we have explored various examples of using the chown command for changing file and directory ownership, including recursive changes and preserving root ownership.

Author

My name is Jan Bodnar, and I am a passionate programmer with extensive programming experience. I have been writing programming articles since 2007. To date, I have authored over 1,400 articles and 8 e-books. I possess more than ten years of experience in teaching programming.

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