source command is usually used to execute the initialization file that has just been modified to take effect immediately, such as environment variables.
Syntax format: source [file]
# 很多时候，我们安装过一些基础软件，会设置一些环境变量，像PATH，通常是编辑~/.bashrc，想让变量即刻生效，就可以使用source source ~/.bashrc
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