Is the output GOPATH empty after mac installs item2?

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vi ~/.bash_profile

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Mar.11,2021

source ~ / .bash_profile

first of all, make sure whether you have changed the default SHELL,. For example, if a lot of people use zsh, to get the configuration file, it will be different!

forget it. I'll just say it! :
if you are using ZSH
you are required to change .zshrc

after cat / etc/shells modifies the default SHELL,.
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