-d -RR, but detached?

Is there a combination of command line options that will create a detached
screen session only if it doesn't already exist?  I can use 'screen -d -m
-S foo' to always create a detached session, and 'screen -d -RR -S foo' to
attach and create if necessary, but can they be combined?

My current best effort is two commands and some shell scripting:

  screen -S foo -q -ls
  if [ $? -eq 8 ]; then
      screen -dm -S foo
  fi

-- 
...computer contrarian of the first order... / http://aperiodic.net/phil/
PGP: 026A27F2  print: D200 5BDB FC4B B24A 9248  9F7A 4322 2D22 026A 27F2
--- --
Unibus timeout fatal trap program lost sorry
                       -- An error message printed by DEC's RSTS operating
                          system for the PDP-11
---- --- --


 
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