It may not have made it into the docs (okay, it clearly hasn't) but
there's a listPorts flag for the command that might be of use?

import maya.cmds as mc
mc.commandPort(name="fish:65499") print
   mc.commandPort(listPorts=1,q=True) [u'mayaCommand', u'fish:65499',
   u'commandportDefault']

(and the only reason I know that exists is because my first reaction was
to run help against the MEL - sometimes the online help takes too dang
long to load :P)

help commandPort // Result:

Synopsis: commandPort [flags] [String] Flags: -q -query -bs -bufferSize
Int -cl -close -eo -echoOutput -lp -listPorts -n -name String -nr
-noreturn -po -pickleOutput -pre -prefix String -rnc -returnNumCommands
-stp -sourceType String -sw -securityWarning


On Thu, May 7, 2015, at 09:05 PM, Tuan Nguyen wrote:
> Hi Justin Thank for extra information, but how can you know which one
> message will be send to in case users open multi-application's
> instance at the same time?
>
> commandPort doesn't allow us to query port's name but only checking
> it. I can do a for loop, but somehow, i feel uneasy with that way :)
>
> On Thu, May 7, 2015 at 5:50 PM, Justin Israel
> <[email protected]> wrote:
>> Are you looking to find out this information from within the Maya
>> process, or external to the Maya process?


>> Maya allows you to open multiple command ports, so there isn't
>> necessarily just one. The docs show how you can query is a specific
>> named port is open:
>> http://download.autodesk.com/global/docs/maya2014/en_us/CommandsPython/commandPort.html

>> If you are looking to find out which ports are open, from outside of
>> Maya, then that is going to depend on which platform you are running.
>> On OSX/Linux you could use the "lsof" command to check what a given
>> process is listening on:


>> # list the tcp sockets that are listening from a Maya pid
>> $ lsof -i 4 -a -p <pid> | grep LISTEN

>> # list the unix domain sockets that are open from a Maya pid
>> $ lsof -U -a -p <pid>

>>


>> Justin


>>


>>
>> On Thu, 7 May 2015 10:01 PM illunara <[email protected]> wrote:
>>
>>>
>>> Hi everybody I wonder if we can get port or port's name using for
>>> commandPort of current maya's instance?. I had been searching on
>>> google for a while but no luck Thanks
>>>


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