'peeking' in on a pipe

[Tim Evans]

I would like to 'peek' in on a pipe, to see what is happening in it, WHILE
IT EXECUTES. I tried something like this, but no luck:
 
  some_stuff | tee `tty` | more_stuff
 
I would like to do this while it executes, not tee to a file and see it
later. Does anyone have any ideas how this might be done?
Thanks,
...Tim


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