export http_proxy='http://proxy.test.cz:1234/'
wget -nvq --proxy-user=test --proxy-password=test google.com &>/dev/null | grep -q 'You cant user internet' || echo "Proxy isnt working. " | mail -s "Proxy isnt working" -r "No-reply<no-reply@soma.cz>" test@mail.cz

wget -nvq --proxy-user=test --proxy-password=test google.com &>/dev/null | grep -q 'You cant user internet' || (echo "Proxy isnt working. " | mail -s "Proxy isnt working" -r "No-reply<no-reply@soma.cz>" test@mail.cz)

#!/bin/bash
OUTPUT_FILE=/tmp/$$.txt
wget -nvq --proxy-user=test --proxy-password=test google.com > ${OUTPUT_FILE} 2>&1

grep -q 'You cant user internet' ${OUTPUT_FILE}
if [ "$?" -eq "0" ]
then
    echo "Proxy isnt working. " | mail -s "Proxy isnt working" -r "No-reply<no-reply@soma.cz>" test@mail.cz
else
    echo "Proxy is working"
fi