Appendix B. Cron Schedules

Utility

Configuration File Format

crontab

minute hour mday month wday command

NodeBrain

define term on(~(time_expression):- command

Utility

Configuration File Entry Example

crontab

20 4 1-15 * * date >/tmp/date.out 2>&1

NodeBrain

define r1 on(~(m(4:20).d(1..15))):= date >/tmp/date.out 2>&1

Crontab Schedule Specification

NodeBrain Time Condition

minute

hour

mday

month

wday

0-59

0-23

1-31

1-12

0-6

<- Range of values

0

0

*

1-5

*

~(n(1..5))

10

*

*

*

*

~(m(10))

0

0

*

*

0

~(su)

20

4

1-15

*

*

~(m(4:20).d(1..15))

5

10

1,7,9

*

1

~(m(10:5).d(1,7,9).mo)

5

10,14

1,7,9

*

1

~(m(5).h(10,14).d(1,7,9).mo)

*         all legal values

x-y      all values from x to y

x,y,z    specified values

NodeBrain’s Equivalent Functions

NodeBrain Time Condition

m(?)

h(?)

d(?)

n(?)

su,mo,tu,we,th,sa

~(m(?).h(?).d(?).n(?).?)

Replace question marks “?” with value in cron columns, ignoring columns with “*” and string the functions together, left to right, separating with a period to form the NodeBrain time expression.  Numbers in the wday column are replaced with two-character day-of-week names.