how to copy I/O not just redirect (Windows and Linux)

I have a simple call command

call calabash -D sim.xpl >test.txt 2>&1

and this redirects into test.txt, how do I do both redirect into a file and allow it to show up in the prompt?

(I could use the command for both linux and windows)

(use case: tar-ring a backup takes a while and watching the the verbose output allows me to keep an eye on it, and kill it early if needed, rather than to open a large file or wait until its done)

Answer

tee

call calabash -D sim.xpl 2>&1 | tee test.txt