rosconsole command line utility not honoring ROSCONSOLE_FORMAT

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How do I make the output of the rosconsole command line utility show in the desired format?

Looking at the source, I don't believe you can.

That script uses a rospy.Subscriber to subscribe to the /rosout topic topic (here), and uses a relatively simple callback to print incoming messages in a fixed format (here):

def _print(self, msg):
    print('[ {} ] [\033[1m{}\033[21m]: {}'.format(
        self._level_string_map[msg.level], msg.name, msg.msg))

    if self._verbose:
        stamp_sec = msg.header.stamp.to_sec()
        stamp_tz = datetime.fromtimestamp(stamp_sec, tzlocal())

        print('          [{} ({:.6f})] [{}]: {}:{}'.format(
            stamp_tz, stamp_sec, msg.function, msg.file, msg.line))

You would have to change the script to get it to print in any other way.

If you do, and there isn't already a PR open, it would be nice to add this feature to the script and submit it for inclusion in rospy.