get current nendo

get_nendo.sh

get_nendo() {
  foreach i ({0..11})                                                                                                                                                                                                      [ ~ ]
    local lmonth=`date -v-${i}m '+%m'`
    if [ $lmonth = "04" ]; then
      local nendo=`date -v-${i}m '+%Y'`
    fi
  end
  echo "$nendo"
}