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/usr/bin/purple-send-async is in libpurple-bin 2.11.0-0+deb8u2.

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

The actual contents of the file can be viewed below.

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#!/bin/sh

METHOD_NAME=$1

if test -z "$METHOD_NAME"
then
    cat <<EOF
This program calls purple API functions using DBus.  As opposed to purple-send,
it does not print the return value.

Usage:

   $0 method-name type1:parameter1 type2:parameter2 ...

This shell script just invokes dbus-send, see man dbus-send for how
to specify the parameters.

Examples:

   $0 PurpleCoreQuit

Use dbus-viewer to get the list of supported functions and their parameters.
EOF
    exit 1
fi

shift
dbus-send --dest=im.pidgin.purple.PurpleService --type=method_call /im/pidgin/purple/PurpleObject im.pidgin.purple.PurpleInterface.$METHOD_NAME "$@"