i use 3 13 1-7 * 5
in cronjob to run my command at first friday of each month,
but i see that the command run on days 1 - 7 and also all fri day!
then i found below note in wikipedia:
if both "day of month" and "day of week" are restricted (not "*"), then either the "day of month" field (3) or the "day of week" field (5) must match the current day.
so, how i can solve the problem?