If you don't wish to specify a value for a field, just place
a * in the field.
minute hour
dom month dow cmd
Examples:
01 * * * * echo "This command
is run at one min past every hour"
17 8 * * * echo "This
command is run daily at 8:17 am"
17 20 * * * echo "This
command is run daily at 8:17 pm"
00 4 * * 0 echo "This command is run at 4 am every Sunday"
* 4 * * Sun echo "So is
this"
42 4 1 * * echo "This command is run 4:42 am every 1st of the
month"
01 * 19 07 * echo "This command is run hourly on the 19th of July"
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