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One super-useful bash feature is anonymous named pipes, which allows the equivalent of multiple pipe "arguments" to a single command.

Instead of:

echo a b c > /tmp/foo

echo d e f > /tmp/bar

diff /tmp/foo /tmp/bar

Just do:

diff <(echo a b c) <(echo d e f)

This feature is known as "process substitution":

That feature is actually named "Process Substitution".

"anonymous named pipes" is contradictory, since anonymous means that something has no name.

Yeah, poor wording on my part. They do have a name, but normally you don't care about it.