I see this one a fair bit these days, so i thought i would write it up. On most machines when i edit crontab i get the following:

amstel:/ # crontab -e
320

And i have to CTRL-D to get out of it. Note that that 320 can be any number, doesn’t matter. The point is you cannot edit cron.

All you have to do is add this line;

EDITOR=/usr/bin/vi;export EDITOR

To /etc/profile or /.bashrc or /.bash_profile etc.