Cronjob to autobackup database

i  have a cronjob setting up as below
1)Command crontab -e
2)Keyin 30 09 * * * /autopgdump.sh
3) Save to new crontab file.
but nothing happen, the backup process won't start.

i manage to perform manual backup by running the following command
sudo ./autopgdump.sh( SH file store under root directory

looking for the correct ways to setting up the cronjob.

thanks



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