Install Homebrew & Basic Homebrew Setup

遇见问题：
==> Downloading and installing Homebrew...
fatal: unable to access 'https://github.com/Homebrew/brew/': Empty reply from server
Failed during: git fetch origin master:refs/remotes/origin/master --tags --force

解决：
vi /etc/hosts后加 192.30.253.113 github.com

Creating a .bash_profile on your mac
A typical install of OS X won't create a .bash_profile for you. When you want to run functions from your command line, this is a must-have.

Start up Terminal
Type "cd ~/" to go to your home folder
Type "touch .bash_profile" to create your new file.
Edit .bash_profile with your favorite editor (or you can just type "open -e .bash_profile" to open it in TextEdit.
Type ". .bash_profile" to reload .bash_profile and update any functions you add.

https://redfinsolutions.com/blog/creating-bashprofile-your-mac

XCODE
https://blog.csdn.net/kangguang/article/details/78935761
homebrew
https://www.cnblogs.com/xd502djj/p/6923690.html

Mac OS X mkdir: /home/test: Operation not supported
https://blog.csdn.net/jecons/article/details/8680100

chflags hidden abc
就可以隐藏。
chflags nohidden abc
就可以显示。

mac中怎样修改文件夹为只读
选中文件夹，command＋i
共享与权限，把所有用户的权限设置为只读即可！
如果修改不了，先点右下角的小锁头，然后输入密码就可以修改了！

Mac 下修改intellij内存设置
选中intellij并右击后点击显示包内容，打开idea.vmoptions，修改为：