debian修改默认编辑器

刚才在一台机器上打开 crontab -e，跳出来的编辑器是nano，太难使...

在debian下是使用 update-alternatives 命令修改默认编辑器。

先查看一下使用帮助

# 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.

修改默认编辑器，选择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

顺着提示看了一下对应的文件，都是软链接，最终指向 /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，可以通过导出变量临时修改编辑器：

export EDITOR="/usr/bin/vim" ; crontab -e

这样，再次打开 crontab -e，跳出来的就是vim了。