Unix Cron Scheduling

1. Logfile
The log files for cron daemon can be found under any of the following file
/var/log/cron
/var/log/syslog


2. View/List Cronjobs
$ crontab -l

3. Schedule Cronjobs
a. Create the cronjob entries as mentioned in Step-4 in a textfile (cron_jobs.txt).
b. Run the following command
$ crontab cron_jobs.txt

4.Linux Crontab Format

MIN HOUR DOM MON DOW CMD

Table: Crontab Fields and Allowed Ranges (Linux Crontab Syntax)

Field	Description	Allowed Value
MIN	Minute field	0 to 59
HOUR	Hour field	0 to 23
DOM	Day of Month	1-31
MON	Month field	1-12
DOW	Day Of Week	0-6
CMD	Command	Any command to be executed.

Reference:
http://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/