You may wonder why anyone would bother to change their default shell.

你可能会质疑为什么一个人要如此麻烦的去改变默认的shell呢？

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The first thing I need to cover is how to install and test a new shell, and how to change the default shell.

首先我要介绍的是如何安装和测试一个新的shell，以及如何改变默认的shell。

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Use the CHSH command to change your shell to TCSH permanently, or type TCSH at the prompt to change your shell without logging in again.

使用chsh命令永久的将你的shell换为tcsh，或者在命令提示符处键入tcsh改变你的shell，而不需要再次登陆系统。

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Crabs that had been shocked but had remained in their shell appeared to remember the experience of the shock because they quickly moved towards the new shell, investigated it briefly and were more likely to change to the new shell compared to those that had not been shocked.

CNN: Crabs 'feel and remember pain' suggests new study

That started to change in 1973, when Shell completed its first liquefied natural gas plant in Brunei.

FORBES: Magazine Article

But despite recent reports to the contrary, there are no signs that Shell is about to change it.

ECONOMIST: A damning verdict | The