How do I write stderr to a file while using "tee" with a pipe?

Question

I know how to use `tee` to write the output (`STDOUT`) of `aaa.sh` to `bbb.out`, while still displaying it in the terminal: ./aaa.sh | tee bbb.out How would I now also write `STDERR` to a file named `ccc.out`, while still having it displayed?

Answer 1

you can do the following

./aaa.sh 2>ccc.out | tee bbb.out

bbb.out will have STDOUT

ccc.out will have STDERR