cron - Format
* * * * * <command>
| | | | |
| | | | +---- Day of the week (0 - 6) (Sunday to Saturday, 7 is also Sunday on some systems)
| | | +------ Month (1 - 12)
| | +-------- Day of the month (1 - 31)
| +---------- Hour (0 - 23)
+------------ Minute (0 - 59)
1. *
: any or every value for specific time field
- example:
0
*
*
*
*
: every 1 hour (at minute 0)
2. */<num>
: every specific time filed
- example:
*
*/2
*
*
*
: every 2 hours
3. Schedule command will not source .bashrc
ensure not using aliases or function defined in .bashrc