The xattr command lists, writes (sets), prints (displays), and deletes the extended attributes of file system objects. An extended attribute is a name:data (key:value) pairing arbitrarily associated with a file system object (e.g. file, directory, or symbolic link). The name of an extended attribute may be any null-terminated UTF-8 string. The data associated with it may be either textual or binary. This implementation of the xattr command is designed to be backwards-compatible with the Python script that shipped as /usr/bin/xattr in Mac OS 10.5.0 (Leopard).
Catalyzer is a powerful and flexible cataloging system that lets you easily organize and maintain structured records about almost anything. It gives you menus, lists, file selectors, buttons, and many more options to let you set up structures to make information entry as efficient and reliable as possible. Operating in server mode, it can expose catalogs and, optionally, the files they refer to across the Web.