Probably working too hard for this cron question

[Kurt Buff]

All,

I've googled a bunch, read some freebsd.org docs, and just can't
figure this out.

I have a script that should read the current date into a variable,
append the time/date stamp at the beginning of the file created with
the date in the variable, do a bunch of cURL stuff, then append a
time/date stamp at the end of the file.

It works if I run it manually, but not from cron.

Here are the batchfile and the cron entry:

----------begin script----------
dt=`/bin/date "+%Y-%m-%d"`
/bin/date > /root/$dt-external1.txt
/usr/local/bin/curl -K /root/urls.txt >> /root/$dt-external1.txt
/bin/date >> /root/$dt-external1.txt
----------end script----------

----------begin crontab----------
15 12 * * *        /root/do-curl.sh
----------end crontab----------

I'm doing all of this as root, as you can see.

The job launches - I can see an entry for cURL in top - but no file in /root.

I've tried several variations on the first line of the script, but I'm
getting nowhere, though I'm sure it's something stupidly simple that
I'm missing.

What am I missing?

Kurt