Ubuntu下的shell:bash?dash

无意间发现Ubuntu的sh默认是指向dash。网上查了一下发现，dash的民意不如bash，据部分网友反映如果用dash编译某些文件，会出现无法编译的情况，但用bash则不会。有些情况下，在脚本中，将#!/bin/bash简写成#!/bin/sh，这个时候用dash编译就会出错了。

 

不管用dash是不是会提高开机速度或者其他什么原因，我先试一下把sh指向bash

 

首先，在终端敲入ls -l /bin/sh，出现

 

lrwxrwxrwx 1 root root 4 2009-08-13 19:31 /bin/sh -> dash

在root下敲入

# dpkg-reconfigure dash

会弹出对话框，选“否”，则切换成功

The default /bin/sh shell on Debian and Debian-based systems is bash. 

However, since the default shell is required to be POSIX-compliant, any shell that conforms to POSIX, such as dash, can serve as /bin/sh. You may wish to do this because dash is faster and smaller than bash.

Install dash as /bin/sh? 

           <是>                       <否>