locale

#!/bin/sh

print_locale_envvars()
{
  printenv | grep "LANG" | grep -v "_LANG" | sed "s/'/\"/g"
  printenv | grep "LC_" | sed "s/'/\"/g"
  printf "LC_ALL=%s\n" "${LC_ALL}"
}

print_all_locales()
{
  echo "C"
  echo "POSIX"
  printenv | grep "LANG" | cut -d'=' -f2 | sed -e "s/'//g" -e "s/\"//g" -e 's/.UTF-8//g'
  printenv | grep "LANG" | cut -d'=' -f2 | sed -e "s/'//g" -e "s/\"//g" -e 's/UTF-8/utf8/g'
  printenv | grep "LC_" | cut -d'=' -f2 | sed -e "s/'//g" -e "s/\"//g" -e 's/UTF-8/utf8/g'
}

all_locales_mode="yes"
for arg in $@
do
  [ $arg = "-a" ] && all_locales_mode="yes" && continue
  echo "$0: unknown option '${arg}'"
done

if [ -z "${all_locales_mode}" ]; then
  print_locale_envvars | sort | uniq
else
  print_all_locales | sort | uniq
fi