OptionsOn chmod itself
-f
Do not display a diagnostic message if chmod could not modify the mode for file, nor modify the exit status to reflect such failures
-H
If the -R option is specified, symbolic links on the command line are followed and hence unaffected by the command. (Symbolic links encountered during tree traversal are not followed.)
-h
If the file is a symbolic link, change the mode of the link itself rather than the file that the link points to
-L
If the -R option is specified, all symbolic links are followed
-P
If the -R option is specified, no symbolic links are followed. This is the default
-R
Change the modes of the file hierarchies rooted in the files, instead of just the files themselves. Beware of unintentionally matching the ``..'' hard link to the parent directory when using wildcards like ``.*''
-v
Cause chmod to be verbose, showing filenames as the mode is modified. If the -v flag is specified more than once, the old and new modes of the file will also be printed, in both octal and symbolic notation
