Gah! I hate it when people only think of user programs and not obvious libc calls.

Prototyped in <stdlib.h>, setenv() sets an environment variable. It takes three args: the first a name string, the second a value string, and the third an int Boolean for whether or not it should be overwritten if it already exists.

    int setenv( const char *name, const char *value, int overwrite );
There is also getenv() which gets a value, and unsetenv() which deletes it. Both of these take one arg: a name string.

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