need sed command/pattern to change a range of lines in a stream

I want to change all but the last line in a file using the sed stream editor.

In vi I would express it this way

1,$-1s/$/,&/g

Which reads "from the first line to the last less 1, add a comma to the end of the line"

basically i am separating a bunch of lines to be fed into excel as a .csv file.
Christopher ScheneSystem Engineer/Software EngineerAsked:
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Gerwin Jansen, EE MVETopic Advisor Commented:
Try this:

sed '$!s/$/,/' your.csv

or to perform the change in your.csv file:

sed -i '$!s/$/,/' your.csv
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Christopher ScheneSystem Engineer/Software EngineerAuthor Commented:
Works, Thank you.
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Gerwin Jansen, EE MVETopic Advisor Commented:
You're welcome :)
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