Script kiểm tra có gmail mới và tự động gửi thông báo đến telegram

#!/bin/bash
gmailtotelegram(){
while :
do
for ((j=1; j<21; j++))
do
timeloop=1
server='https://mail.google.com/mail/feed/atom'
domain='gmail.com'
gmail="$username@$domain"
unset email title summary message stttelegram
username='' 
password=''
token=''
chatid=''

file_email=/root/$username/email_$username
file_title=/root/$username/title_$username
file_summary=/root/$username/summary_$username
file_new=/root/$username/new_hexdump_hoanghd_$username
file_hexdump=/root/$username/data_hexdump_hoanghd_$username
file_message=/root/$username/message_$username

check_new_hexdump_hoanghdfile=$((ls $file_new >> /dev/null 2>&1 && echo yes) || echo no)
if [[ $check_new_hexdump_hoanghdfile == 'no' ]];then touch $file_new; fi

check_data_hexdump_hoanghdfile=$((ls $file_hexdump >> /dev/null 2>&1 && echo yes) || echo no)
if [[ $check_data_hexdump_hoanghdfile == 'no' ]];then touch $file_hexdump; fi

touch $file_email $file_title $file_summary

curl -u "$gmail":"$password" --silent "$server" | grep -oP "(?<=<email>)[^<]+" | awk "FNR>=$j && FNR<=$j" > $file_email
curl -u "$gmail":"$password" --silent "$server" | grep -oPm1 "(?<=<title>)[^<]+" | sed '1d' | awk "FNR>=$j && FNR<=$j" > $file_title
curl -u "$gmail":"$password" --silent "$server" | grep -oPm1 "(?<=<summary>)[^<]+" | awk "FNR>=$j && FNR<=$j" > $file_summary

# curl -u "hoangbp562@gmail.com":"HadanghoangHathiyen19901993" --silent "https://mail.google.com/mail/feed/atom" | grep -oPm1 "(?<=<summary>)[^<]+" | head -n 2
email=$(cat $file_email)
title=$(cat $file_title)
summary=$(cat $file_summary)

if [[ $email == '' || $title == '' || $summary == '' ]];then status=0; else status=1; fi
rm -rf $file_email $file_title $file_summary
echo -e "\nEmail: $email\nTitle: $title\nSummary: $summary" > $file_message
message=$(cat $file_message)

hexdump -C $file_message | grep -Eo '[0-9]' | tr -d '\n' > $file_new

new_hexdump_hoanghd=$(cat $file_new)
check_data_hexdump=$(cat $file_hexdump | grep "$new_hexdump_hoanghd")

if [[ $check_data_hexdump == '' ]];then
	hexdump_value=0
	echo "$new_hexdump_hoanghd" >> $file_hexdump
else
	hexdump_value=1
fi

if [[ $status == 1 && $hexdump_value == 0 ]]; then
URL="https://api.telegram.org/bot$token/sendMessage"
curl -s -X POST $URL -d chat_id=$chatid -d text="$message" >> /dev/null
stttelegram='Yes'
sleep $timeloop
else
sleep $timeloop
stttelegram='No'
fi
echo -e "\n---------------------------------------------------\nCheck new email status number: $j $status $hexdump_value\nSend telegram: $stttelegram\nEmail: $email\nTitle: $title\nSummary: $summary\n---------------------------------------------------"
done
done

}
gmailtotelegram