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chsh
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用来更换登录系统时使用的shell
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## 补充说明
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**chsh命令** 用来更换登录系统时使用的shell。若不指定任何参数与用户名称，则chsh会以应答的方式进行设置。
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### 语法
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```
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chsh(选项)(参数)
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```
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### 选项
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```
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-s<shell 名称>或--shell<shell 名称>：更改系统预设的shell环境。；
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-l或--list-shells：列出目前系统可用的shell清单；
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-u或--help：在线帮助；
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-v或-version：显示版本信息。
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```
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### 参数
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用户名：要改变默认shell的用户。
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### 实例
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**查看系统安装了哪些shell的两种方法：**
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第一种：
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```
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[rocrocket@localhost ~]$ chsh -l
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/bin/sh
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/bin/bash
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/sbin/nologin
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/bin/zsh
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```
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第二种：
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```
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[rocrocket@localhost ~]$ cat /etc/shells
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/bin/sh
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/bin/bash
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/sbin/nologin
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/bin/zsh
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```
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其实`chsh -l`也是来查看这个文件。
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**查看当前正在使用的shell：**
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```
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[rocrocket@localhost ~]$ echo $SHELL
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/bin/bash
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```
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注意SHELL一定要是大写。可以看到，目前使用的shell是`/bin/bash`
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**把我的shell改成zsh：**
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```
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[rocrocket@localhost ~]$ chsh -s /bin/zsh
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Changing shell for rocrocket.
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Password:
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Shell changed.
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[rocrocket@localhost ~]$
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```
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使用chsh加选项`-s`就可以修改登录的shell了！你会发现你现在执行`echo $SHELL`后仍然输出为`/bin/bash`，这是因为你需要重启你的shell才完全投入到zsh怀抱中去。`chsh -s`其实修改的就是`/etc/passwd`文件里和你的用户名相对应的那一行。现在来查看下：
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```
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[rocrocket@localhost ~]$ cat /etc/passwd|grep ^rocrocket
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rocrocket:x:500:500:rocrocket,China:/rocrocket/PSB/home:/bin/zsh
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```
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你可以发现输出内容的最后部分已经变成了`/bin/zsh`了，下次重启的时候，linux就会读取这一命令来启动shell了！
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**把shell修改回/bin/bash：**
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```
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[rocrocket@localhost ~]$ chsh -s /bin/bash
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Changing shell for rocrocket.
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Password:
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Shell changed.
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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