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/usr/bin/xrandr-tool is in xdiagnose 3.6.3build2.

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The actual contents of the file can be viewed below.

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#! /usr/bin/python
# -*- Mode: Python; coding: utf-8; indent-tabs-mode: nil; tab-width: 4 -*-
#
# Copyright (C) 2010-2012 Bryce Harrington <bryce@canonical.com>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from __future__ import absolute_import, print_function, unicode_literals

import re
import os
import sys
import subprocess

# Add project root directory (enable symlink, and trunk execution).
PROJECT_ROOT_DIRECTORY = os.path.abspath(
    os.path.dirname(os.path.dirname(os.path.realpath(sys.argv[0]))))

if (os.path.exists(os.path.join(PROJECT_ROOT_DIRECTORY, 'xdiagnose'))
    and PROJECT_ROOT_DIRECTORY not in sys.path):
    sys.path.insert(0, PROJECT_ROOT_DIRECTORY)
    os.putenv('PYTHONPATH', PROJECT_ROOT_DIRECTORY) # for subprocesses

if __name__ == "__main__":
    from xdiagnose import info
    from xdiagnose.utils.option_handler import OptionHandler
    from xdiagnose.utils import debug

    opt_hand = OptionHandler(info)
    opt_hand.add('-v', '--verbose', dest='verbose',
                 help='Show debug messages',
                 action='store_true', default=False,
                 desc='Turns on verbose debugging output.')
    opt_hand.add('-f', '--fails-to-start', dest='failure_to_start',
                 help="Troubleshoot failure to start a graphical X11 session",
                 action='store_true', default=False,
                 desc='Launch the GUI failsafe-X session to troubleshoot why X11 did not start.')
    opts, args = opt_hand.parse_args()
    debug.DEBUGGING = opts.verbose

    if len(args) < 1:
        print("Usage:  xrandr-tool <command>")
        print()
        print("Commands:")
        print("  outputs")
        print("  current-resolution [output-name]")
        print("  resolutions [output-name]")
        sys.exit(1)

    command = args[0]
    output_name = None
    if len(args) > 1:
        output_name = args[1]

    re_output = re.compile("^(.*) (?:disconnected|connected) (.*)")
    re_res    = re.compile("^   (\d+x\d+) *(.*)")

    # The results from xrandr are given in terms of the available display devices.
    # One device can have zero or more associated modes.  Unfortunately xrandr
    # indicates this through indentation and is kinda wordy, so we have to keep
    # track of the context we see mode names in as we parse the results.
    process = subprocess.Popen(['xrandr'], stdout=subprocess.PIPE)
    xrandr_stdout, xrandr_stderr = process.communicate()
    current_output_name = None
    for line in str(xrandr_stdout, encoding='utf8').split("\n"):
        m = re_output.match(line)
        if m:
            current_output_name = m.group(1)
            if command == "outputs":
                print(current_output_name)

        if "resolution" in command:
            m = re_res.match(line)
            if m and current_output_name == output_name:
                res = m.group(1)
                if command == "current-resolution":
                    if line.find('*') != -1:
                        print(res)
                else:
                    print(res)