What is the correct way to set up login environment in crontab?

[Peng Yu]

Hi,

I need to use cron to run some job. I know that cron only set up very
basic environment. I'd like to duplicate my login environment. But
some environment variables are still not seen when I set the following
crontab entry. Does anybody know how to correctly set up the login
enviroment? (The manual describes what files are sourced, but I don't
want to manually source these files. I'm looking for a simpler way.)

* * * * * /bin/bash -i -l -c '/path/programtorun.sh > /tmp/my.log'


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Regards,
Peng