getenvvar.c

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

int main(int argc, char *argv[]) {
    char *ptr;

    if(argc < 3) {
        printf("Usage: %s <environment variable> <target name program>\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    ptr = getenv(argv[1]); /* get env var location */
    ptr += (strlen(argv[0]) - strlen(argv[2]))*2; /* adjust for program name */

    printf("%s will be at %p\n", argv[1], ptr);

    return EXIT_SUCCESS;
}
//gcc -m32 getenvvar.c -o getenvvar