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sed parsing

From: Randy Yates
Subject: sed parsing
Date: 01 Jun 2005 11:24:02 -0400
User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Military Intelligence)

I have a path string, "xyz", that I want to prefix a volume specification
to (under MS-Windows), so that I get "v:\xyz". If I use the following

  echo "xyz" | sed "s/^/v:\\/"

I get a "unterminated `s' command" response. Why? It
seems that sed is associating the second "\" in "\\/"
with the "\" instead of with the first "\". Why? What
is the proper way to accomplish the substitution?
Randy Yates
Sony Ericsson Mobile Communications
Research Triangle Park, NC, USA, 919-472-1124

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