system/programs/xmonad/xmobar/scripts/cbr.sh

#!/bin/bash

set -e

today=$(date +%d/%m/%Y)
prev_week=$(date +%d/%m/%Y -d '-7 day')

usd=R01235

cc=($(curl --no-progress-meter "https://www.cbr.ru/scripts/XML_dynamic.asp?date_req1=$prev_week&date_req2=$today&VAL_NM_RQ=$usd" | \
  sed -e "s/<[A-Z]/\n\0/g" | \
  grep Value | \
  sed -e "s#<\/\?\w\+>##g" | \
  sed -e "s/,/./g"))

diff=$(echo ${cc[-1]} ${cc[-2]} | awk '{ print $1 - $2 }')
arror="↑"
color='#50fa7b'
if [ ${diff:0:1} == '-' ]; then
  diff=${diff:1}
  arror="↓"
  color='#ff5555'
fi

echo "${cc[-1]} (<fc=${color}>${arror}<hspace=3/>${diff}</fc>)"

exit 0