How can I print intermediate results from a pipeline to the screen?

Question

Duplicate http://stackoverflow.com/questions/570984/how-can-i-gzip-standard-in-to-a-file-and-also-print-standard-in-to-standard-out

I'm trying to count the lines from a command and I'd also like to see the lines as they go by. My initial thought was to use the tee command:

complicated_command | tee - | wc -l

But that simply doubles the line count using GNU tee or copies output to a file named - on Solaris.

Answer 1

The solution is to tee to the console directly as opposed to STDOUT:

tty=`tty`
complicated_command | tee $tty | wc -l

Answer 2

complicated_command | tee /dev/tty | wc -l

But keep in mind that if you put it in a script and redirect the output, it won't do what you expect.