I've spent a non-trivial amount of time trying to work out how to do in Powershell what in bash would be: program | tee filename.txt & It's also too verbose a

I've spent a non-trivial amount of time trying to work out how to do in Powershell what in bash would be: program | tee filename.txt & It's also too verbose and needs too much shift for me to comfortably use as a shell. So why not just use a 'real' language if I'm going to write a script?