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How to merge columns into lines, using unique keys?

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# 1  
Old 03-06-2012
How to merge columns into lines, using unique keys?
I would really appreciate a sulution for this :


Code:
invoice#    client#
5929    231
4358    231
2185    231
6234    231
1166    464
1264    464
3432    464
1720    464
9747    464
1133    791
4930    791
5496    791
6291    791
8681    989
3023    989
7935    989
8809    989
8873    989

My goal is to achieve this:

Client #    Invoice #
231    5929; 4358; 2185; 6234
464    1166; 1264; 3432; 1720; 9747
791    1133; 4930; 5496; 6291
989    8681; 3023; 7935; 8809; 8873

Thank you very much.
Hemo
# 2  
Old 03-06-2012
Try:
Code:
awk 'NR>1{a[$2]=a[$2]?a[$2]"; "$1:$1}END{for (i in a) print i,a[i]}' file

# 3  
Old 03-07-2012
Thank you kindly, it works like a charm.

Hemo
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