Hi. I'm trying to remove duplicate entries in a text file. It's a simple English-Polish dictionary. Basically, I have a file like this:

anatomy=anatomia
ancestor=poprzednik
ancestor=przodek
ancestral=dziedziczny
ancestral=rodowy
ancestry=pochodzenie
ancestry=przodkowie
anchor=kotwica
[download]

when what I want is this:

anatomy=anatomia
ancestor=poprzednik, przodek
ancestral=dziedziczny, rodowy
ancestry=pochodzenie, przodkowie
anchor=kotwica
[download]

My problem is - I don't know my way around Perl the way I'd like to, so I'm not sure how to approach this. Right now, I'm thinking about regular expressions and substitutions, something like this:

  #!/usr/bin/perl
  while (<>) {
      s{
        (^[^=]+)        #should match the duplicated word
        [=]
        (.+)            #should be the translation after the "="
        \n
        \1
        [=]
        (.+)
        \n
     }{$1=$2, $3}xig;
    print;
  }
[download]

But I think that (if this works), it's a solution for doubled entries, not tripled ones. Could anyone tell me, how to replace any number of repetitions in a file like mine? For example, my input file is:

ancient=starozytny
ancillary=pomocniczy
ancillary=sluzebny
ancillary=wspomagajacy
and=a, coraz, i
and=oraz
anecdote=anegdota
anemone=zawilec
[download]

and the output should be:

ancient=starozytny
ancillary=pomocniczy, sluzebny, wspomagajacy
and=a, coraz, i, oraz
anecdote=anegdota
anemone=zawilec
[download]

Thanks for any suggestions.

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