环境：centos6.9 （虚拟机）
1，查看系统当前shell
[root@centos6 ~]# echo $SHELL
/bin/bash
[root@centos6 ~]#
2，查看当前环境有哪些shell
[root@centos6 ~]# cat /etc/shells
/bin/sh
/bin/bash
/sbin/nologin
/bin/dash
[root@centos6 ~]#
2.1，我们发现没有zsh，，那么安装zsh
[root@centos6 ~]# yum install zsh
3，切换到zsh
[root@centos6 ~]# chsh -s /bin/zsh
Changing shell for root.
Shell changed.
[root@centos6 ~]#
3.1，再次查看当前shell
[root@centos6 ~]# echo $SHELL
/bin/zsh
- 如果发现还是bash 没关系，，随便打一个常用命令，如果他能自动补全其实就已经切换成功了，重启下就行了
4，下载oh-my-zsh
[root@centos6 ~]# wget https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh
5，安装和配置
5.1，先安装git
[root@centos6 ~]# yum install git
5.2，修改刚才下载的脚本的权限并安装
[root@centos6 ~]# ls -l
总用量 4
-rw-r--r--. 1 root root 4019 1月 26 06:16 install.sh
[root@centos6 ~]# chmod +x install.sh
[root@centos6 ~]# ./install.sh
Cloning Oh My Zsh...
Initialized empty Git repository in /root/.oh-my-zsh/.git/
remote: Counting objects: 849, done.
remote: Compressing objects: 100% (713/713), done.
remote: Total 849 (delta 16), reused 777 (delta 10), pack-reused 0
Receiving objects: 100% (849/849), 578.66 KiB | 199 KiB/s, done.
Resolving deltas: 100% (16/16), done.
Looking for an existing zsh config...
Using the Oh My Zsh template file and adding it to ~/.zshrc
Time to change your default shell to zsh!
Changing shell for root.
Shell not changed.
__ __
____ / /_ ____ ___ __ __ ____ _____/ /_
/ __ \/ __ \ / __ `__ \/ / / / /_ / / ___/ __ \
/ /_/ / / / / / / / / / / /_/ / / /_(__ ) / / /
\____/_/ /_/ /_/ /_/ /_/\__, / /___/____/_/ /_/
/____/ ....is now installed!
Please look over the ~/.zshrc file to select plugins, themes, and options.
p.s. Follow us at https://twitter.com/ohmyzsh.
p.p.s. Get stickers and t-shirts at https://shop.planetargon.com.
➜ ~
6，zsh的主题文件存放在这里
/root/.oh-my-zsh/themes/
7，修改主题的话只需要编辑这个文件
vim /root/.zshrc
ZSH_THEME="theme_file_name"
8，应用生效
source /root/.zshrc
