brew install zsh zsh-completions

将brew安装路径添加到系统shells中

>sudo vi /etc/shells

add line as:

/usr/local/bin/zsh

then change shell with zsh:

chsh -s /usr/local/bin/zsh

为什么是这个目录？或者说怎么查询zsh的版本和安装路径？

>zsh --version

to check out the version

>echo $SHELL

to check out the install path

I just install zsh with brew,so the path is:/usr/local/bin/zsh-5.8

else you will fine error hint like :

non-standard shell

macos - How to change the Login Shell on Mac OS X from bash to zsh? - Super User

1. Test that it worked with echo $SHELL. Expected result: /bin/zsh or similar.

2. Test with $SHELL --version. Expected result: 'zsh 5.8' or similar

Installing ZSH · ohmyzsh/ohmyzsh Wiki (github.com)