Send message to Telegram chat via bash script

up.sh

#!/bin/bash
###########################################################
# UPdate SDOC production script, v0.1                     #
# (c) October 2017 by Serg N. Kalachev <[email protected]> #
###########################################################

START_HOUR=10
END_HOUR=19
CUR_HOUR=`date +"%H"`
TELEGRAM_AUTH="<censored>:<censored>"
TELEGRAM_CHAT="<censord>" 
TELEGRAM_CMD="curl --silent --show-error --fail -G -o /dev/null https://api.telegram.org/bot${TELEGRAM_AUTH}/sendMessage -d chat_id=${TELEGRAM_CHAT} "
SEND_MSG=1

[[ "$CUR_HOUR" -ge "$END_HOUR" ]] && SEND_MSG=0
[[ "$CUR_HOUR" -lt "$START_HOUR" ]] && SEND_MSG=0

[[ "$SEND_MSG" == "1" ]] && ${TELEGRAM_CMD} --data-urlencode "text=Произвожу обновление системы..."

bin/mage deploy to:production
ssh sdoc "sudo /etc/init.d/apache2 restart"

[[ "$SEND_MSG" == "1" ]] && ${TELEGRAM_CMD} --data-urlencode "text=Обновление системы выполнено."