Is there a way to ‘uniq’ by column?

by 
sort -u -t, -k1,1 file
  • -u for unique
  • -t, so comma is the delimiter
  • -k1,1 for the key field 1

Test result:

[email protected],2009-11-27 00:58:29.793000000,xx3.net,255.255.255.0
[email protected],2009-11-27 01:05:47.893000000,xx2.net,127.0.0.1

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