- To setup cron file in ubuntu

- Open the Terminal

- Type crontab -e

- Setup the cron file
1 2 3 4 5 /path/to/command arg1 arg2

Where,
1: Minute (0-59)
2: Hours (0-23)
3: Day (0-31)
4: Month (0-12 [12 == December])
5: Day of the week(0-7 [7 or 0 == sunday])
/path/to/command - Script or command name to schedule