[ale] crontab

[cfowler at outpostsentinel.com (Chris Fowler)]

I want to execute a script at 6pm on the first Thursday of each month.
Is there a trick in crontab I can do?

Here are the fields allowed

              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)

The only thing I can think of off the top of my head is to run it every
Thursday and then check to see if we are the first Thursday of the
month. If not, exit 0.