为什么我的命令行不是从cron运行的？

我有一个perl脚本（属于 XMLTV 系列的抓取工具 ，特别是 tv_grab_oztivo ）。

I have a perl script (part of the XMLTV family of "grabbers", specifically tv_grab_oztivo).

我可以这样成功运行：

/sw/bin/perl /path/to/tv_grab_oztivo --output /path/to/tv.xml

$ b b

我使用完整路径来消除工作目录中的问题。权限不应该是一个问题。

I use the full paths to everything to eliminate issues with the Working Directory. Permissions shouldn't be a problem.

所以，如果我从终端（Mac OSX）运行它的工作正常。

So, if I run it from the Terminal (Mac OSX) it works just fine.

但是当我将其设置为通过cron作业运行时，没有任何事情发生。没有输出创建等。

But when I set it to run via a cron job, nothing appears to happen at all. No output is created etc.

crontab没有什么问题，只要我看到，因为如果我替换helloworld.pl的实际脚本，它在正确的时间运行正常。

There isn't anything wrong with the crontab as far as I can see, because if I substitute a helloworld.pl for the actual script, it runs just fine at the right time.

那么，我能做什么来调试？在这两种情况下，我可以从％ENV 看到环境是非常不同的，但是我可以采取什么其他方法来调试？如何查看cron作业的输出，这可能是shell或任何其他类型的perldie消息或not found消息？

So, what can I do to debug? I can see from looking at %ENV in the two cases that the environment is very different, but what other approaches can I take to debugging? How can I see the output of the cron job, which might be some kind of perl "die" message or "not found" message from the shell or whatever?

我应该试图以某种方式给予cron版本的命令与当它作为我运行时相同的环境。

Or should I be trying to somehow give the cron version of the command the same environment as when it's running as me?