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From: Nuno Silva <nunojsilva@invalid.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: How can I use sed to insert a character into a file?
Date: Mon, 08 Jul 2024 20:43:00 +0100
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On 2024-07-08, Jon Danniken wrote:

> 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!

in general, my guess would be something like (for sed's s command)

    s@\(<type:color>\)\(......\)\(</type:color>\)@\1#\2\3@g

Other approaches will surely be possible, say, if these are the only
sequences of hex digits that show up, or if this always appears on a
line by itself (so maybe matching lines on <type:color> and then
replacing the sequence of digits with #& could be done too - & being the
matched text)

Treat this like it had been written on a napkin over my knee, I may have
made a stupid mistake above or overlooked something obvious, surely
others will chime in with better suggestions. There's also
comp.unix.programmers, and I think also a shell group, which might be
helpful audiences too.

-- 
Nuno Silva