How can I use sed to insert a character into a file?

Sujet : How can I use sed to insert a character into a file?
De : nonesuch (at) *nospam* nottodaynortomorroreither.org (Jon Danniken)
Groupes : comp.os.linux.misc
Date : 08. Jul 2024, 20:44:54

Autres entêtes

Organisation : A noiseless patient Spider
Message-ID : <v6hc36$vv1m$1@dont-email.me>
User-Agent : Mozilla Thunderbird

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!

Date	Sujet	#	Auteur
8 Jul 24	How can I use sed to insert a character into a file?	4	Jon Danniken
8 Jul 24	Re: How can I use sed to insert a character into a file?	1	Nuno Silva
8 Jul 24	Re: How can I use sed to insert a character into a file?	2	Thomas Zajic
8 Jul 24	Re: How can I use sed to insert a character into a file?	1	Jon Danniken

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