Re: a problem on crontab time format
Thanks a lot. I just think it's at least a `weak' bug: Any crontab
item specifying the minute slot as `*' may be a potential disaster.
On Sun, Jan 23, 2011 at 00:32, elbbit <elbbit@gmail.com> wrote:
> On 23/01/11 05:14, Kejia柯嘉 wrote:
>> On Sun, Jan 23, 2011 at 12:11 AM, Kejia柯嘉 <w.kejia@gmail.com> wrote:
>>> How does the following crontab line run:
>>> * 1 * * * * my_command
>>> Every minute of every 1 o'clock? Or only once of every 1 o'clock?
>> Sorry, the crontab line is:
>> * 1 * * * my_command
>>
>
> You need to understand how cron(8) matches the time code you set in the
> configuration file. To re-iterate the man page available with "man 5
> crontab":
>
> field allowed values
> ----- --------------
> minute 0-59
> hour 0-23
> day of month 1-31
> month 1-12 (or names, see below)
> day of week 0-7 (0 or 7 is Sun, or use names)
>
> A field may be an asterisk (*), which always stands for ``first-last''.
>
> So, using the above as a guide, I approximate a translation of your
> configuration line as saying: "at every minute of the hour 1 on every
> day of month and during every month and on every day of the week please
> run command my_command"
>
> Hope this helps.
>
> --
>
> elbbit
>
>
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