04-10-2015
Your post are a bit difficult to read. It will help if you separated your text (in plain) from code and output (in code tags) plus some paragraphing/indenting.
Anyhow, I wouldn't have expected grep jack to show anything on your system as the probability you have a user jack is low. Try grep nancy.
A "prw" file is a FIFO (named pipe), here created by root/sys for a perhaps totally different purpose.
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LEARN ABOUT DEBIAN
jack.udp
JACK.UDP(1) JACK.UDP(1)
NAME
jack.udp - JACK UDP Transport Client
SYNOPSIS
jack.udp [options] send|recv
OPTIONS
-b : Set the ring buffer size in frames (default=4096). -c : Set the client name (default=jack.udp-PID). -n : Set the number of channels,
and therefore the number of JACK ports (default=2). -p : Set the port number (default=57160). -r : The remote host name, for use in send
mode (default="127.0.0.1").
DESCRIPTION
jack.udp is a UDP audio transport mechansim for JACK. The send mode reads signals from a set of JACK input ports and sends UDP packets to
the indicated port at the indicated host at a rate determined by the local JACK daemon. The recv mode reads incoming packets at the indi-
cated port and writes the incoming data to a set of JACK output ports at a rate that is determined by the local JACK daemon.
This transport mechanism is unreliable. Both send and recv clients will report buffer overflow and underflow occurences, and recv clients
will report dropped and out-of-order packets, and shutdown on channel mismatch packets. In practice this mechanism can be made highly reli-
able over local networks.
jack.udp implements no connection logic, use jack.plumbing(1) instead.
EXAMPLE
192.0.0.1:~$ jack.udp -r 192.0.0.2 send
192.0.0.2:~$ jack.udp recv
AUTHOR
Rohan Drape http://slavepianos.org/rd/
SEE ALSO
jackd(1)
AUTHOR
Rohan Drape <rd@slavepianos.org>
Author.
01/10/2012 JACK.UDP(1)