This command provides several operations on a file's name or attributes.
Option indicates what to do with the file name.
Any unique abbreviation for option is acceptable. If the file doesn't exist or its access time cannot be queried then an error is generated. If name refers to a root directory, then the root directory is returned. Note that tilde substitution will only be performed if it is necessary to complete the command. Under UNIX this command uses the real user and group identifiers, not the effective ones.