You know you run tcsh. fish users usually know they run fish. You don't expect to be able to run arbitrary copy-pasted shell snippets in the first place.

I try to run my scripts on /bin/sh (on a system where that's not just a symlink to a fancier shell) before posting them. That means it's more portable, but still not universal. I don't typically have bash on my BSD systems, and when I do, they're not installed to /bin, so this is also somewhat out of self interest as well.