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A double-quoted string preceded by a dollar sign (‘$’) will cause
the string to be translated according to the current locale.
If the current locale is C or POSIX, the dollar sign
is ignored.
If the string is translated and replaced, the replacement is
double-quoted.
Some systems use the message catalog selected by the LC_MESSAGES
shell variable. Others create the name of the message catalog from the
value of the TEXTDOMAIN shell variable, possibly adding a
suffix of ‘.mo’. If you use the TEXTDOMAIN variable, you
may need to set the TEXTDOMAINDIR variable to the location of
the message catalog files. Still others use both variables in this
fashion:
TEXTDOMAINDIR/LC_MESSAGES/LC_MESSAGES/TEXTDOMAIN.mo.