tuns http dev:3000 ssh tuns.sh
# turns into
ssh -R dev:80:localhost:3000 tuns.sh
# user has access to the ssh command and can pass whatever to it
tuns http :3000 ssh -o IdentitiesOnly=yes -i ~/.ssh/id_ed25519 tuns.sh
# result
ssh -R 80:localhost:3000 -o IdentitiesOnly=yes -i ~/.ssh/id_ed25519 tuns.sh
# we can super default for tuns.sh
tuns :3000
# result
ssh -R 80:localhost:3000 tuns.sh