std::getenv

`<cstdlib>`
`char* getenv( const char* env_var );`

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. `getenv`, POSIX `setenv()`, `unsetenv()` `putenv()` , , , .	( C++11)
( ) , -. , POSIX `setenv()`, `unsetenv()` `putenv()` , .	( C++11)

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env_var

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POSIX environ, extern char **environ; <unistd.h>, main.

#include <iostream>
#include <cstdlib>

int main()
{
    if(const char* env_p = std::getenv("PATH"))
        std::cout << " PATH : " << env_p << '\n';
}

:

 PATH : /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

C getenv







(C++20)

(C++20)
(C++11)





(C++20)


/

(C++11)
(C++11)
(C++11)
(C++17)

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std::getenv