[gentoo-user] How to tell Cron X is running or not

Scripts that test for X running might work in a shell but not when the
script is run by cron.

For example:  This code:
  tty|grep pts
  retval=$?
  if [[ $retval > 0 ]];then
    print "X isn't running just now... postponing rsync of WWW
    until such time as it is... exiting"
    exit
  fi

Runs fine when run from a user shell, but when cron runs it the test
always fails to be true.

So how can I test for X running in case where script will be run by cron?

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