execute.h

#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<string>
#include<string.h>
#include<limits.h>
#include<vector>
#include<sys/types.h>
#include<sys/wait.h>
#include<stdio.h>
#include<stdlib.h>
using namespace std;

void TOKENIZE_COMMAND(vector<string> space_split,char *command[])
{
    int i=0;
    vector<string>::iterator over_space;
    for(over_space=space_split.begin();over_space!=space_split.end();over_space++)
    {
        command[i]=new char[2000];
        strcpy(command[i],(*over_space).c_str());
        i++;          
    }
}

void EXECUTE_COMMAND(char *command[])
{
    int pd[2];
    pipe(pd);
    if(!fork())
    {
        close(1);
        dup2(pd[1],1);
        execvp(command[0],command);
        abort();
    }
    wait(0);
    dup2(pd[0],0);
    close(pd[1]);
}

void EXECUTE_COMMAND_FORK(char *command[],int fd0,int fd1)
{
    int pd[2];
    pipe(pd);
    if(!fork())
    {
        if(fd0!=0)
        {
            dup2(fd0,STDIN_FILENO);
        }
        if(fd1!=0)
        {
            dup2(fd1,STDOUT_FILENO);
        }
        close(1);
        dup2(pd[1],1);
        execvp(command[0],command);
        abort();
    }
    wait(0);
    dup2(pd[0],0);
    close(pd[1]);
}