Mac 升级bash 到4或者5版本

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[lookback@LookBack-MBP ~]$ /bin/bash --version
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin17)
Copyright (C) 2007 Free Software Foundation, Inc.
[lookback@LookBack-MBP ~]$

# 安装brew
[lookback@LookBack-MBP ~]$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
# 安装bash
[lookback@LookBack-MBP ~]$ brew install bash
#替换bash
[lookback@LookBack-MBP ~]$ echo $(brew --prefix)/bin/bash | sudo tee -a /private/etc/shells
/usr/local/bin/bash
[lookback@LookBack-MBP ~]$ cat /private/etc/shells
# List of acceptable shells for chpass(1).
# Ftpd will not allow users to connect who are not using
# one of these shells.

/bin/bash
/bin/csh
/bin/dash
/bin/ksh
/bin/sh
/bin/tcsh
/bin/zsh
/usr/local/bin/bash
#最后用chpass命令来更新用户的shell，下面我以lookback用户为例
[lookback@LookBack-MBP ~]$ sudo chpass -s /usr/local/bin/bash lookback

1. 验证通过bash和sh命令查看版本：

[lookback@LookBack-MBP ~]$ bash --version
GNU bash，版本 4.4.23(1)-release (x86_64-apple-darwin17.5.0)
Copyright (C) 2016 Free Software Foundation, Inc.
许可证 GPLv3+: GNU GPL 许可证第三版或者更新版本 <http://gnu.org/licenses/gpl.html>

本软件是自由软件，您可以自由地更改和重新发布。
在法律许可的情况下特此明示，本软件不提供任何担保。
[lookback@LookBack-MBP ~]$

[lookback@LookBack-iMAC-10.15.7 ~]$ bash --version
GNU bash, version 5.0.18(1)-release (x86_64-apple-darwin19.6.0)
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
[lookback@LookBack-iMAC-10.15.7 ~]$

[lookback@LookBack-iMAC-10.15.7 ~]$ bash --version
GNU bash, version 5.1.16(1)-release (x86_64-apple-darwin21.1.0)
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.