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Proposed Prompt Escapes

From: Dennis Williamson
Subject: Proposed Prompt Escapes
Date: Thu, 5 Nov 2015 18:26:19 -0600

It might be handy to have some of the escapes that work in $'string' quoting to also work in prompts especially now with the address@hidden transformation.

Specifically the hex, unicode and control ones: \xHH, \uHHHH, \UHHHHHHHH and \cx.

I presume that the dollar-single-quote escapes should not be touched since they are "specified by the ANSI C standard". Also, they needn't be since we have the @P transformation.

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