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Yes my good man. But if you look at the drawing and think about it the output of the command that is going to run will need to be written to the input of next command. So making the output write to...

Ok yes i see. I had a different idea of what dup did, i have only been doing this Unix stuff for about a week. But in reallity it wont really change my program to close those because they will just...

See when i do something like this:
tmpin = dup(0);
I am just saving the fact that my parent process's 0th file descriptor was pointing to stdin in tmpin.

By the time my program gets to fork(),...

At the point when fork is called, the parent process is not pointing to the standard input and output, tmpin and tmpout. So wouldnt the child not have anything pointing to those after fork?

This is how i see my code working with the file descriptors and pipes and well every thing. Take a look at the picture to see what i am talking about, it is very descriptive and took a long time to...

//save in/out
int tmpin = dup(0);
int tmpout = dup(1);

//set initial input
int fdin;
if(_inputFile)
{
fdin = open(_inputFile, O_RDONLY | O_CREAT, S_IREAD | S_IWRITE);
}
else...