tente a seguinte solução, por favor:
chmod +x test.py
chmod +x /root/testing/cron-work.sh
chmod +x /root/testing/cron-work2.sh
chmod +x /root/testing/cron-work3.sh
chmod +x /root/testing/cron-work4.sh
echo "22 23 * * * sh /root/testing/cron-work.sh" >> /root/cron1.log
echo "23 23 * * * sh /root/testing/cron-work2.sh" >> /root/cron2.log
echo "24 23 * * * sh /root/testing/cron-work3.sh" >> /root/cron3.log
echo "14 23 * * * sh /root/testing/cron-work4.sh" >> /root/cron4.log
chmod +x root/cron1.log
chmod +x root/cron2.log
chmod +x root/cron3.log
chmod +x root/cron4.log
/etc/init.d/crond start #redhat based servers like centos
/etc/init.d/cron start #debian based servers like ubuntu
crontab cron1.log
crontab cron2.log
crontab cron3.log
crontab cron4.log