maybe I am just too tired.
I think the other day I confirmed "which sh" replied bash.
Anyway,

in Obarun
echo \n will unexpectedly print a newline.
echo \\n will print the whack+n that I wanted.
Fatdog also uses bash and acts as I expect.

Is the terminal doing any parsing before bash gets the text ?
i prefer to use readlink instead of which to know the shell used 
% readlink /usr/bin/sh
No special thing is made on Obarun with the shell.

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