End of line CRLF (\ r \ n) instead of LF (\ n)

when in a pipeline you can use:  tr -d '\r'

echo -e "\r\n\r\n\r\n" | tr -d '\r' | od -c

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Easy approach...

dos2unix file-list-to-fix

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I think you are trying to change from LF to CRLF, so

sed -i 's/$/\r/' file_to_change.txt

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Much depends on what you are doing and how it is reflected.

\r ^M
cat -v your text file to see what you are dealing

As Kent and David mentioned, dos2unix is the way to do this, and should be part of most unix builds these days.  You can also go the other way, converting <LF> to <CR><LF> via the counterpart command unix2dos.

• Linux dos2unix, unix2dos command help and examples

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»bp

I suggested unix2dos on the other question, but bibi92 said they couldn't install extra software. unix2dos is not present by default on Raspberry Pi OS.

you can use python, perl, tr if avalable sed, etc.

cat -v can help confirm what you have and what you want to get rig of.
ctrl-v+key will enter its control character

@bill: Kent Olsen already mentioned dos2unix before, david was the 2nd mention.

@bill: Kent Olsen already mentioned dos2unix before, david was the 2nd mention.

Thanks, I adjusted my prior post.

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»bp

SED seems like the simplest approach, have you tried that?

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»bp