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chown — Change File Owner and Group

Change file owner and group with chown — fix ownership after copying, set permissions for web servers and services, and apply changes recursively.

chown changes who owns a file or directory – its user and group. You reach for it constantly: ownership is often wrong after copying or extracting an archive, a web server such as www-data needs access to its files, or you want to reclaim control over a project directory. The chown user:group file syntax sets both at once, while a leading colon (:group) changes the group only. Be careful with the recursive -R flag: it rewrites ownership across entire directory trees, and aimed at system paths like / it can render your installation unusable. Almost every chown call needs sudo, because only root may change the owner of files it does not own.

Change Owner

chown <user> <file> — Change the owner of a file.

sudo chown www-data index.html

chown <user>:<group> <file> — Change both owner and group.

sudo chown www-data:www-data index.html

chown :<group> <file> — Change only the group (shorthand).

sudo chown :developers project/

chown <user> <file1> <file2> — Change owner of multiple files.

sudo chown www-data *.html *.php

Recursive

chown -R <user>:<group> <dir> — Change ownership recursively for a directory.

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

chown -R --preserve-root <user> <dir> — Recursive with protection against operating on /.

sudo chown -R --preserve-root deploy:deploy /opt/app/

Options

chown -v <user> <file> — Verbose: report each change.

sudo chown -v www-data *.php

chown -c <user> <file> — Report only when a change is made.

sudo chown -c www-data *.php

chown --reference=<ref> <file> — Set ownership to match a reference file.

sudo chown --reference=index.html newfile.html

chown -h <user> <symlink> — Change ownership of a symlink (not its target).

sudo chown -h www-data /var/www/current

Common Patterns

chown -R www-data:www-data /var/www/ — Set web server ownership for a website directory.

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

find <dir> -type f -exec chown <user> {} + — Change owner of files only (not directories).

sudo find /var/www -type f -exec chown www-data {} +

find <dir> -type d -exec chown <user> {} + — Change owner of directories only.

sudo find /var/www -type d -exec chown www-data {} +

chown $(id -u):$(id -g) <file> — Set file ownership to current user.

sudo chown $(id -u):$(id -g) downloaded-file.tar.gz

chown -R $USER:$USER <dir> — Reclaim ownership of a directory for current user.

sudo chown -R $USER:$USER ~/projects/

Conclusion

chown is quick to reach for whenever a file's ownership is wrong – usually chown user:group file is enough, often combined with find -type f/-type d to treat files and directories separately. Treat the recursive -R variant with respect: it reaches into entire directory trees, and a typo in the path – especially in system areas like /, /etc or /usr – can break services or render the system unusable. Check the target path before you confirm, use --preserve-root as a safety net, and reach for -v/-c when in doubt to see exactly which changes happen. Closely related is chmod, which sets access permissions, while ls -l and stat show you the current ownership.

Further Reading

  • chmod – set access permissions on files and directories
  • ls – list directory contents including owner and permissions
  • stat – detailed file information including ownership