crontab -e = edits the crontab file to be used.

min     hour     dayofmonth     monthofyear     dayofweek     command
0         12        14                    2                        *                    /home/user/ param1
Options     Explanation
*                 Is treated as a wild card. Meaning any possible value.
*/5             Is treated as ever 5 minutes, hours, days, or months. Replacing the 5 with another numerical value will change this option.
2,4,6         Treated as an OR, so if placed in the hours, this could mean at 2, 4, or 6 o-clock.
9-17             Treats for any value between 9 and 17. So if placed in day of month this would be days 9 through 17. Or if put in hours it would be between 9 and 5.

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