It's actually a pretty simple model. Every process has an array of open file objects. File descriptors are indexes into that array. "Redirection" copies the

It's actually a pretty simple model. Every process has an array of open file objects. File descriptors are indexes into that array. "Redirection" copies the underlying entries, and are processed left-to-right. "Redirecting streams" winds up being confusing - it's all just `dup2`.