You can set schedule in linux with this command:
$ crontab -e
for example:
We want our job to run at 5 A.M., which would be minute 0, hour 5, every day of the month, every month, every day of the week. We need to add a line to the bottom of the file which looks like this:
0 5 * * * /home/myname/scripts/do-every-day.sh
for backup everyday at 12:02 AM
2 0 * * * tar -zcf /home/hrt/Desktop/backup/$(date +\%H-\%M-\%S-\%d-\%m-\%Y).tar.gz /usr/local/bro/logs>/dev/null 2>&1
for fixing bug in ubuntu you have to add >/dev/null 2>&1 to every crontab you define.
For checking your crontab, use this command:
$crontab -l
For removing crontab just add this one:
$crontab -r
For viewing logs run this command:
sudo grep -i cron /var/log/syslog
