install_builtin_commands

# File lib/shell/command-processor.rb, line 558
    def self.install_builtin_commands
      # method related File.
      # (exclude open/foreach/unlink)
      normal_delegation_file_methods = [
        ["atime", ["FILENAME"]],
        ["basename", ["fn", "*opts"]],
        ["chmod", ["mode", "*FILENAMES"]],
        ["chown", ["owner", "group", "*FILENAME"]],
        ["ctime", ["FILENAMES"]],
        ["delete", ["*FILENAMES"]],
        ["dirname", ["FILENAME"]],
        ["ftype", ["FILENAME"]],
        ["join", ["*items"]],
        ["link", ["FILENAME_O", "FILENAME_N"]],
        ["lstat", ["FILENAME"]],
        ["mtime", ["FILENAME"]],
        ["readlink", ["FILENAME"]],
        ["rename", ["FILENAME_FROM", "FILENAME_TO"]],
        #      ["size", ["FILENAME"]],
        ["split", ["pathname"]],
        ["stat", ["FILENAME"]],
        ["symlink", ["FILENAME_O", "FILENAME_N"]],
        ["truncate", ["FILENAME", "length"]],
        ["utime", ["atime", "mtime", "*FILENAMES"]]]

      def_builtin_commands(File, normal_delegation_file_methods)
      alias_method :rm, :delete

      # method related FileTest
      def_builtin_commands(FileTest,
                   FileTest.singleton_methods(false).collect{|m| [m, ["FILENAME"]]})

    end