Question

How to use the getenv function to access the list of environment variables in C

Answer 1

#include <stdio.h>
#include <stdlib.h>

// Windows
 
int main(void)
{
    char *env_path = getenv("PATH");

    if (env_path)
        printf("PATH = %s\n", env_path);
        
    return 0;
}

/*
run:
 
PATH = C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Win
dows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;c:\Program Files\
Java\jdk1.8.0_91\bin\;C:\Program Files\CodeLite

*/

 

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Answer 2

#include <stdio.h>
#include <stdlib.h>
 
// Linux
  
int main(void)
{
    char* p = getenv("PATH");
  
    if (p)
        printf("PATH = %s\n", p);
}
  
  
  
/*
run:
  
PATH = /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
*/

 

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