I'm running screen -D -R (with optionally using -S name), and it works great, but has one problem - when given screen doesn't exist earlier, i get notification "New screen...", and irritating wait.
How can I disable this particular notification?
Answer
Unfortunately, this behavior is hard-coded in the source: the same test is used to determine whether to emit the “New screen...” notification and to determine whether to attach to a running session. (In the screen 4.0.3 source, (rflag && (rflag & 1) == 0) in attacher.c and screen.c — rflag is 1 for -r plus 2 for each -R.)
If you're willing to recompile, the patch is trivial: remove the line that displays the message from screen.c.
You can make the message go away by typing something. If you don't want to type a key that will reach the application inside the screen window, you can type C-a ` or some other unbound key.
A simple workaround of sorts is to immediately detach the screen session (either with C-a d or with the detach command in the screenrc file; -m on the command line doesn't work for this when -R is also specified), then attach to it again (e.g. by running the same command again).
A really kludgy but fully automated workaround is to include the following lines in the screenrc file to skip messages initially and reenable them one second later:
msgwait 0
screen -t post_initialization 39 sh -c 'sleep 1; screen -X msgwait 5'
(39 is the highest possible window number, it's a compile-time option (MAXWIN).)
Note that both workarounds will hide any message screen chooses to display when it starts, not just the useless “New screen...” one.
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