Something very important to realise when running a cron job is, the job was not started by a user shell. Your personal .shellrc or .profile will not have run. The PATH setting will be minimal. Other environment variables you might rely will be unset. Your cron program will not run in an interactive environment. Unless you redirect something, there won't be anything on STDIN. Output to the STDOUT and STDERR channels will typically be mailed to you.

But enough of this guessing. Without knowing what you do, how can we tell what is going wrong? Perhaps you made a cron syntax error.

Abigail