chown
Unix-like operating system command
The command chown, an abbreviation of change owner, is used on Unix and Unix-like operating systems to change the owner of file system files and directories. Unprivileged users who wish to change the group membership of a file that they own may... Wikipedia
Example: chown root /u
Syntax: chown -RhLHPcvf... OWNER<.|:>GROUP FILE...
Original author(s): Ken Thompson, Dennis Ritchie