#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
int main(){
    int status;
    //subshell
    int pid=fork();
    if(pid){
        waitpid(pid,&status,0);
        return status;
    } else{
        int pip[2];
        pipe(pip);
        int st;
        //cat
        int pid1=fork();
        if(!pid1){
            dup2(pip[1],1);
            close(pip[1]);
            close(pip[0]);
            execlp("cat","cat","a",NULL);
        }
        //cut
        int pid2=fork();
        if(!pid2){
            dup2(pip[0],0);
            close(pip[0]);
            close(pip[1]);
            //redirection
            int out=open("out",O_CREAT|O_WRONLY|O_APPEND,644);
            dup2(out,1);
            close(out);
            execlp("cut","cut","-d;","-f1",NULL);
        }
        close(pip[1]);
        close(pip[0]);
        waitpid(pid1,&st,0);
        waitpid(pid2,&st,0);
        //echo
        if(WEXITSTATUS(st)>0){
            if(!fork()){
                execlp("echo","echo","benis",NULL);
            }
            wait(&st);
        }
        exit(st);
    }
}