Pipe only STDERR through a filter

Question

Is there any way, in bash, to pipe STDERR through a filter before unifying it with STDOUT? That is, I want

STDOUT ────────────────┐                        ├─────> terminal/file/whatever STDERR ── [ filter ] ──┘ 

rather than

STDOUT ────┐            ├────[ filter ]───> terminal/file/whatever STDERR ────┘ 

Answer 1

Here's an example, modeled after how to swap file descriptors in bash . The output of a.out is the following, without the 'STDXXX: ' prefix.

STDERR: stderr output STDOUT: more regular  ./a.out 3>&1 1>&2 2>&3 3>&- | sed 's/e/E/g' more regular stdErr output 

Quoting from the above link:

1. First save stdout as &3 (&1 is duped into 3)
2. Next send stdout to stderr (&2 is duped into 1)
3. Send stderr to &3 (stdout) (&3 is duped into 2)
4. close &3 (&- is duped into 3)