automatically search for an attached screen session at login and reattach

cb0@home:~/$cat >> ~/.bashrc << EOF
if [ \$SSH_TTY ] && [ ! \$WINDOW ]; then #comment out for local usage
  SCREENLIST=\`screen -ls | grep 'Att'\`
  if (( ! \$? )); then
    echo -e "Screen running and attached:\n \${SCREENLIST}"
  else
    screen -U -R
  fi
fi #comment out for local usage
EOF

[:edit:]

The script above only works when you connect through ssh. If you login from a real terminal $SSH_TTY and $WINDOW won't be set.
Comment out lines marked for local usage if like screen as much as i do.