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Environment variable from within a .c


I want to ask a couple of things.

How would you set an environment variable from within a .c file in Linux? Is the variable contained within the shell's memory space only? I am asking this because if the shell isn't there, is it possible to play with environment variables?

Kindly tell me a URL/online resource where I can read how to make use of the GNU dev support tools like autoconf and configure and all the rest.


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