You need to step back and say what you're trying to accomplish.
If you want some commands to run with a specific shell, explicitly run that shell.
If this is something that's output is being fed back to a parent shell (e.g. you're sourcing the output from it to set environment variables) the way I've seen most things behave is to presume the shell is Borne-ish unless a flag (say, -c) is given on the command line (in which case it spits out csh-y output).
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Want more info? How to link or
or How to display code and escape characters
are good places to start.