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(guile.info)Locales

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Locales
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 - primitive: setlocale category [locale]
     If LOCALE is omitted, returns the current value of the specified
     locale category as a system-dependent string.  CATEGORY should be
     specified using the values `LC_COLLATE', `LC_ALL' etc.

     Otherwise the specified locale category is set to the string LOCALE
     and the new value is returned as a system-dependent string.  If
     LOCALE is an empty string, the locale will be set using
     envirionment variables.