Pathname#chmod

Changes the mode of the entry at the path in self; returns 1. See Filesystem Modes and especially Setting a Mode.

These examples use a helper method, mode, that displays a mode both in octal digits and in characters:

dirpath = 'doc/foo'
dir_pn = Pathname(dirpath)
dir_pn.mkdir         # Create directory.
mode(dirpath)        # => "040775 drwxrwxr-x"
filepath = File.join(dirpath, 't.tmp')
file_pn = Pathname(filepath)
file_pn.write('bar') # Create file.
mode(filepath)       # => "100664 -rw-rw-r--"
file_pn.chmod(0755)  # Change file mode.
mode(filepath)       # => "100755 -rwxr-xr-x"
dir_pn.chmod(0644)   # Change directory mode.
mode(dirpath)        # => "040644 drw-r--r--"
dir_pn.rmtree        # Clean up.