"A 'named pipe'--also known as a FIFO (First In, First Out) or
just fifo--is an inter-process communication mechanism that makes
use of the filesystem to allow two processes to communicate with
each other. In particular, it allows one of these to open one end
of the pipe as a reader, and the other to open it as a writer.
Let's take a look at the FIFO and how you can use it.
"First, here's a real-life example of a named pipe at work. In
this instance, you run a shell command like: 'ls -al | grep myfile'
In that example, the 'ls' program is writing to the pipe, and
'grep' is reading from it. Well, a named pipe is exactly that, but
the processes don't have to be running under the same shell, nor
are they restricted to writing to STDOUT and reading from STDIN.
Instead, they reference the named pipe via the filesystem..."
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