Change user and group ownership of files and directories. More information: https://www.gnu.org/software/coreutils/chown.
chown user path/to/file_or_directory
chown user:group path/to/file_or_directory
user
:chown user: path/to/file_or_directory
chown -R user path/to/directory
chown -h user path/to/symlink
chown --reference path/to/reference_file path/to/file_or_directory