[Nate75Sanders]

One useful addition to the section on streams would have been that of process substitution:

http://tldp.org/LDP/abs/html/process-sub.html

This allows you to have more than just the standard streams.

[veyron]

It's bash-specific (sh doesn't support it)

[Nate75Sanders]

It's not bash-specific. Other shells have it.

[veyron]

But not the bourne shell

[nikcub]

not POSIX.