`chown` tool is used to change the ownera and group of file and directory. To make it accessible to particular group or user it can modify the file ownership.
chown [option] [owner[:group]] fileName
[ -c ] :gives output when only changes are made.
[ -R ] :It changes the attributes for directory and all the files/Directory inside it.
[ --from [Current_owner:Current_group] ] :It changes only when owner and group are same as specified.
You can learn more about chown from man page. `man chown`