Modify directory crontab looks in for crontab file?

问题

I have a crontab file at /etc/crontab. I didn't place it there, it was already there, along with a lot of other files in /etc. However, when I type the command crontab -e, it creates a new file. I want it to look for crontab in /etc. This is what the command line says when I type crontab -e.

no crontab for root - using an empty one
~
~
~
~
~
"/tmp/crontab.vx7AxR" 0L, 0C

After a complete edit, this is what I end up with. Any ideas?

[root@server ~]# crontab -e
no crontab for root - using an empty one
crontab: installing new crontab
"/tmp/crontab.uJzKS0":1: bad day-of-month
errors in crontab file, can't install.
Do you want to retry the same edit? 

Contents of the crontab file:

0 * * * * /var/www/html/myfile.py

Thanks, I appreciate it. I wish there was more info out there about customizing crontab.

来源：https://stackoverflow.com/questions/20942074/modify-directory-crontab-looks-in-for-crontab-file