Help with Crontab

[Kevin Kinsey]

Drew Tomlinson wrote:
> I'm trying to use cron to run a script on the first Sunday of every 
> month at 0930.  I used this entry in the crontab:
> 
> # Run 1st Sunday at 0930 - Fulls
> 30 9 1-7 * 7 /usr/local/scripts/backup_bootstrap.sh
> 
> Yet this script just ran on Thursday, December 6 at 0930.   Why?  I just 
> added it to cron so I don't know if it will run on any other days.
> 

See crontab(5), which says:

  Note: The day of a command's execution can be specified by two fields --
     day of month, and day of week.  If both fields are restricted (ie, are
     not *), the command will be run when either field matches the current
     time.  For example, ``30 4 1,15 * 5'' would cause a command to be run at
     4:30 am on the 1st and 15th of each month, plus every Friday.

HTH,

Kevin Kinsey