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#include <stdlib.h>
char *getenv(const char *name);
/* Returns: pointer to value associated with name, NULL if not found */
int putenv(char *str);
/* Returns: 0 if OK, nonzero on error */
int setenv(const char *name, const char *value, int rewrite);
int unsetenv(const char *name);
/* Both return: 0 if OK, −1 on error */
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