LOCALE.ALIAS(5) File Formats Manual LOCALE.ALIAS(5)

locale.alias
locale alias file

locale.alias

The locale.alias file describes locale aliases. Each line of this file can be described as the following BNF:
line			:=	src ws dst
src			:=	locale_name
			|	locale_category_name
ws			:=	<white spaces>
dst			:=	locale_name
			|	"/FORCE"
locale_category_name	:=	locale_name '/' category_name
category_name		:=	"LC_CTYPE"
			|	"LC_COLLATE"
			|	"LC_TIME"
			|	"LC_NUMERIC"
			|	"LC_MONETARY"
			|	"LC_MESSAGES"
locale_name		:=	<locale name>

/usr/share/locale/locale.alias
This file.

ja_JP.UTF-8/LC_CTYPE		en_US.UTF-8
This means that “ja_JP.UTF-8” for LC_CTYPE category is redirected to “en_US.UTF-8”.
Pig				/FORCE
This means that “Pig” for all categories is forcibly enabled.

locale(1), nls(7)

The locale.alias file appeared in NetBSD 3.0.
July 22, 2004 NetBSD 9.4