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How can I instruct BSD sed to interpret escape sequences like \n and \t?

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http://unix.stackexchange.com – I have a sed replacement command that I would like to be compatible with BSD sed as well as GNU sed. Extended regular expressions are not an issue as I do not need them in this case. My primary problem is difference in the way that the two seds interpret character escape sequences in the replacement strings. My replacement string contains tabs and newlines and I'd like them to be visible in the command strings for ease of maintenance, however, BSD sed doesn't interpret the escape sequences and GNU sed does. What is the appropriate way to instruct sed to interpret these escape sequences on B (HowTos)