本文详细介绍了如何创建、删除环境变量以及将其持久化的方法，包括使用`.bash_profile`文件和`source`命令，适用于长期环境变量管理。
1 new a file named "tt",whatever
2 write "export TCS=123" into tt
3 exit tt, return to commander line, "source tt"
4 env | grep TCS
if you want to create a env variable for a long time, you should do that in ~/.bash_profile and then source ./.bash_profile
if you want to delete a env variable, just "unset TCS"
linux 设置环境变量
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