The  format  of  a  symbolic  mode  is  [ugoa...][[+-=][perms...]...], where perms is either zero or more
letters from the set rwxXst, or a single letter from the set ugo.  Multiple symbolic modes can be  given,
separated by commas.

Change the mode of each FILE to MODE.

-c, --changes
       like verbose but report only when a change is made

--no-preserve-root
       do not treat `/' specially (the default)

--preserve-root
       fail to operate recursively on `/'

-f, --silent, --quiet
       suppress most error messages

-v, --verbose
       output a diagnostic for every file processed

--reference=RFILE
       use RFILE's mode instead of MODE values

-R, --recursive
       change files and directories recursively

--help display this help and exit

--version
       output version information and exit