How to remove trailing commas and points from a CSV file ?

Hi dear list:

Please forgive my lack of Perl credentials, but i am a complete beginner

But, and that is the problem, I do have an urgent issue and that's why
I came to perl in the very first instance

I have a CSV file, which comes in the following format:

a,b,.,.,.,.,.,.,.
b,c,d,.,.,.,.,.,.
e,f,g,h,.,.,.,.,.
i,j,k,l,m,.,.,.,.

and so on

My problem: how could I get rid of the trailing points and commas, so
the output CSV file could get following neat format (without the
trailing points and its commas separators):

a,b
b,c,d
e,f,g,h
i,j,k,l,m

I mean, the points repressent missing values in the original CSV,
which are separated by commas

Once the points start to appear in the line, the line does not hold
any not-missing value, I mean, after a points starts, there will be
only points (and their commas separators) till the end of the line

If a perl program could detect a point, in a line, the logic of the
solution could be to make a Return to the next line, forgetting the
rest of the previous line.

How could I manage that operation with perl ?

Thank you very much for your help

Regards

Erasmo
.

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