剛才在一台機器上打開 crontab -e，跳出來的編輯器是nano，太難使...
在debian下是使用 update-alternatives 命令修改默認編輯器。
先查看一下使用幫助
# update-alternatives --help
Usage: update-alternatives [<option> ...] <command>
--config <name>：show alternatives for the <name> group and ask the user to select which one to use.
修改默認編輯器，選擇4 /usr/bin/vim.basic
# update-alternatives --config editor
There are 5 choices for the alternative editor (providing /usr/bin/editor).
Selection Path Priority Status
------------------------------------------------------------
* 0 /bin/nano 40 auto mode
1 /bin/ed -100 manual mode
2 /bin/nano 40 manual mode
3 /usr/bin/emacs23 0 manual mode
4 /usr/bin/vim.basic 30 manual mode
5 /usr/bin/vim.tiny 10 manual mode
Press enter to keep the current choice[*], or type selection number: 4
update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/editor (editor) in manual mode
順着提示看了一下對應的文件，都是軟鏈接，最終指向 /usr/bin/vim.basic
# ls -l /usr/bin/editor
lrwxrwxrwx 1 root root 24 Dec 8 2015 /usr/bin/editor -> /etc/alternatives/editor
# ls -l /etc/alternatives/editor
lrwxrwxrwx 1 root root 18 Aug 14 15:00 /etc/alternatives/editor -> /usr/bin/vim.basic
另外，可以通過導出變量臨時修改編輯器：
export EDITOR="/usr/bin/vim" ; crontab -e
這樣，再次打開 crontab -e，跳出來的就是vim了。