Hello everyone,
I use Pd almost always with multiple MIDI devices in my OSX. So I want to get the right way to start Pd with some flags.
If I give the following command:

/Applications/Pd-extended.app/Contents/MacOS/Pd-extended -midiindev 1,2,3,4

I get the following feedback:

david$ /Applications/Pd-extended.app/Contents/MacOS/Pd-extended -midiindev 1,2,3,4
tk scaling is 1.0
retrying connect...
retrying connect...
retrying connect...
retrying connect...
retrying connect...
retrying connect...
retrying connect...
retrying connect...
retrying connect...
connecting stream socket: Invalid argument (22)

Is this the right way?
Thanks in advance

Hmm, maybe the answer is silly but ...anyone?

I can't remember if it's still the case, but I don't believe startup flags work from the command line in OSX. I think you have to set them in the Pd-extended -> Preferences -> Startup... dialog.

Thanks for the answer Maelstorm but I always had problems with the Startup options.

I have tried to make a new entry with the startup command:
"-listdev -midiindev 1,2,3,4 -nomidiout"
OR
"pd -listdev -midiindev 1,2,3,4 -nomidiout"

but when Pd-extended starts says: "-listdev -midiindev 1,2,3,4 -nomidiout: can't load library" in the console and of course nothing happens from these flags.
Thanks in advance

I think you put them in the wrong spot. In the Startup... dialog, there should be a field at the bottom labeled "startup flags". By default it should have something like

-helppath ~/Library/Pd -helppath /Library/Pd

already in it. Just add your flags to the end.

YES!
It worked, thank you much although I feel a bit silly