From: Fritz Wuehler <fritz@spamexpire-202407.rodent.frell.theremailer.net>
Subject: Re: How can I use sed to insert a character into a file?
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Date: Tue, 09 Jul 2024 16:26:11 +0200
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Jon Danniken <nones...@nottodaynortomorroreither.org> [JD]:
JD> <type:color>000000</type:color>
JS> <type:color>FFFFFF</type:color>

JD> the tags are hex colors ... but need to begin with a pound sign (#)


# append a pound sign after the first instance of ">"
< file sed 's@>@&#@'


Or, if you are a fan of 'awk'

# replace the first instance of ">" with ">#" and print the line
< file awk '{sub(">",">#")}1'