Usage: chown [OPTION]... [OWNER][:[GROUP]] FILE...
Change the owner and/or group of each FILE to OWNER and/or GROUP.

  -R, --recursive        operate on files and directories recursively
      --help     display this help and exit

Leave out OWNER or GROUP to keep the current one.

Examples:
  chown alice notes.txt        alice becomes the owner of notes.txt
  chown -R alice:users /data   same for /data and everything below it, group users

(GreenRay AIO simulates the options listed above.)
