Cygwin 1.7(even in 1.5) user logined through cygwin.bat can't show whit "w" command

[Huang Bambo]

As showed in the title.
If I start a shell from cygwin.bat, the "w" and "who" command showed
nothing while the shell from ssh can.
And I also think the tty should be pts/x, not ttyx.

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