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Thanks very much.

What does the system call "dup" do?

What is the difference between dup and dup2

I have a fair idea of what it does but I am confused when its coming down to the exact details...

Please help...

Red Hat Linux 7.1

I used the command:

type -all cd

:)

Thanks rwb1959.......but thats not what exactly that I wanted....
A more detailed guidance would be really helpful for me...

It doesnt exist in the bin....

Unix gives a message....

"cd is a shell built in"

why is 'cd' a shell built in and not an executable?

I want to implement my own simple multi tasking shell in Unix which will take care of redirection (<, >, >>) and piping.
I am just unable to get a concrete idea of how exactly I have to start. I...