convmv converts filenames (not file content), directories, and even whole filesystems to a different encoding. This comes in very handy if, for example, one switches from an 8-bit locale to a UTF-8 locale. It has some smart features: it automatically recognizes if a file is already UTF-8 encoded (thus partly converted filesystems can be fully moved to UTF-8) and it also takes care of symlinks. Additionally, it is able to convert from normalization form C (UTF-8 NFC) to NFD. This is important for interoperability with Mac OS X for example, which uses NFD, while Linux and most other Unixes use NFC. Though it's primary written to convert from/to UTF-8 it can also be used with almost any other charset encoding.
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