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From: Jon Danniken <nonesuch@nottodaynortomorroreither.org>
Newsgroups: comp.os.linux.misc
Subject: How can I use sed to insert a character into a file?
Date: Mon, 8 Jul 2024 13:44:54 -0500
Organization: A noiseless patient Spider
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I'm sure this is trivial to most here, but sed confounds me.  I have an 
xml file with content following this format:

<type:color>000000</type:color>
<type:color>FFFFFF</type:color>

The information within the tags are hex colors (many different colors), 
but they need to begin with a pound sign (#) to work in a particular 
application, ie:

<type:color>#000000</type:color>
<type:color>#FFFFFF</type:color>

How can I use sed to append the pound symbol in this file? Using sed 4.8 
BTW, thanks!