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/usr/bin/a2j is in a2jmidid 8~dfsg0-1ubuntu2.

This file is owned by root:root, with mode 0o755.

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#!/bin/sh
#
# This script accesses a2jmidid over dbus
# and behaves as a2jmidid in non-dbus mode
#

if test $# -eq 1 -a x$1 = x-e
then
    echo "hardware ports export"
    a2j_control ehw
else
    a2j_control dhw
fi

a2j_control start
trap "a2j_control stop; exit" INT TERM
read unused