list-parsing problem

[Marcus Claesson]

Hi People,

I have a silly little list-parsing problem that I can't get my head
around, and I'm sure some of you have come across it before.

I have a list like this:

1       a
2       b
2       c
3       a
4       d
4       d
4       e
4       f
5       g

and I want to make the first column non-redundant and collect the second
column values on the same line, like this:

1       a
2       b,c
3       a
4       d,e,f
5       g

Please note that line 4 only has one 'd'.

I've tried with both hashes and arrays (don't want to confuse you so I
won't display them here), but nothing really works...

I would really appreciate any help!

Marcus




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