Suppose I am running tee inside a command executed by parallel.
I would like to gzip the output from tee:
... | tee --gzip the_file | and_continue
bash process substitution is useful for cases like this. Something like:
... | tee >(gzip -c the_file) | and_continue
If you're choosing different files in a parallel run and need to format the name differently each time, take a look at GNU Parallel argument placeholder in bash process substitution for how that has to change (to defer the process substitution to act per parallel job).