UNIX for Advanced & Expert Users

setenv("myvar","bla bla",1); 
system("myvar=$(grep....)); 

printf("%s\n", getenv("myvar"));

system("myvar=hello");

system("myvar=hello; echo $myvar");

VAR=$( ...)

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

int main (int argc, char *argv[])
{
        FILE *pipein;
        char readbuf[80], Myvar[80];

        if ((pipein = popen("pwd", "r")) == NULL)

        {
                perror("popen");
                exit(1);
        }

        fgets(readbuf, 80, pipein);
        close(pipein);

        setenv(Myvar, readbuf, 1);

        printf("%s", getenv(Myvar));

        return(0);

}