#!/bin/sh

usage() {
	echo 'Usage: varlist VARNAME < ...'
}

VARNAME="${1:-}"
eval "$(assert-arg -- "$VARNAME" 'VARNAME')"

printf '%s = \\\n' "$VARNAME"
env LANG=POSIX.UTF-8 sort |
	sed 's|^\(.*\)$|\t\1 \\|'
printf '\n'