C language EXECL function

#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/types.h>
#include <string.h>

int main(int argc, char *argv[])
{
    
    // execl function 
    // int execl(const char *pathname, const char *arg, ...

    // pathname:  The path of the file to execute （ Absolute path is recommended ）
    //  The second parameter is a string , Is the parameter of the executable file specified in the first parameter （ It can be multiple parameters ）
    //  The first parameter is the program name （ No dice ）
    //  The second start is the parameters of the program 
    //  The last parameter requires null end （ Used to inform execl End of parameter list —— sentry ）

    if (fork() > 0)
    {
    
        printf("I'm parent process: pid: %d\n", getpid());
        sleep(1);
    }
    else
    {
    
        //  Is currently a child process 
        // execl("/mnt/c/Users/x/Pictures/code/lesson14/2", "2", NULL);

        execl("/bin/ps", "ps", "a", "u", "x", NULL);

        printf("I'm child process: %d", getpid());
    }
    for (int i = 0; i < 3; i++)
    {
    
        printf("i=%d, pid: %d\n", i, getpid());
    }
}