Debian/bin/shdash 的链接,如果大家想用 bash 作为 default shell 的话,可以用以下的办法修改:

1) 直接将/bin/sh做成bash的链接,即可!(升级之后可能会恢复到dash);

2) Bash as /bin/sh by default(以下是官方wiki上给出来的解决方法)

If your Jessie system is configured, so /bin/sh is dash, you can revert to bash using the command:

sudo dpkg-reconfigure bash

and follow the instructions.