Re: order of flags

[Micah Cowan]

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James wrote:
> hello,
> just wanted to know why the following command gives:
> 
> $ screen -RRx
> There is no screen to be attached.
> 
> whereas typing:
> 
> $ screen -xRR
> 
> gives a new screen session. (or attaches to an existing one with multiuser 
> mode)
> 
> at the moment i'm using the second command as my "always run screen
> like this"  favorite...
> 
> wasn't sure if this was a bug or a weirdism of screen.
> let me know your thoughts or i should be doing something differently, thanks.

Looking at the code:

...
                case 'r':
                case 'R':
#ifdef MULTI
                case 'x':
#endif
                  if (ac > 1 && *av[1] != '-' && !SockMatch)
                    {
                      SockMatch = *++av;
                      ac--;
                      debug2("rflag=%d, SockMatch=%s\n", dflag, SockMatch);
                    }
#ifdef MULTI
                  if (*ap == 'x')
                    xflag = 1;
#endif
                  if (rflag)
                    rflag = 2;
                  rflag += (*ap == 'R') ? 2 : 1;
                  break;
...

It appears that -x always includes the functionality of specifying -r; so
        screen -RRx
is the same as
        screen -xRr
In both versions, rflag ends up at 3, whereas with
        screen -xRR
rflag ends up at 4, just like -RR.

I don't know enough about rflag to know the full meaning of this. I'm
not certain what was intended, but I'm guessing -x was intended to imply
- -r on its own, but messing with existing -r/-R combos wasn't intentional.

I've filed an issue for this at
https://savannah.gnu.org/bugs/index.php?23939

- --
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer,
and GNU Wget Project Maintainer.
http://micah.cowan.name/
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