Comma insertions

perl -pe '$_=reverse;s/\d{3}(?=\d)(?!.*?\.)/$&,/g;$_=reverse'
Insert a comma where necessary when counting large numbers. I needed to separate huge amounts of packets and after 12+ hours of looking in a terminal, I wanted it in readable form.
Sample Output
more numberfile
34234324324234
9438752687324713254275341234
32476
325379846846524395732

perl -pe '$_=reverse;s/\d{3}(?=\d)(?!.*?\.)/$&,/g;$_=reverse' numberfile
34,234,324,324,234
9,438,752,687,324,713,254,275,341,234
32,476
325,379,846,846,524,395,732

2
By: sil
2009-02-18 16:34:18

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What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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