| Category | Description |
| LC_CTYPE | Encoding information. From a programmer's point of view, |
| LC_COLLATE | Category related to sorting, e.g., strcoll() and the sort |
| LC_MESSAGES | POSIX/NLS locale indicates the language for |
| LC_MONETARY | Describes how to show money; localeconv() is the only function |
| LC_NUMERIC | Describes how to show general numbers, e.g., the character for |
| LC_TIME | Indicates how to display time and date, e.g., AM/PM and day-month-year |
| LC_RESPONSE | The XPG2 category describes local answers |
| LC_ALL | This auxiliary category works as a wildcard and helps set the same |
| LANG | NLS category. If LC_ALL is not set, it works as LC_ALL. Indicates |
| NLSPATH | Shell variable points to localized objects' location in XPG. X11 and Motif may use it. |