linux - Is there a way to 'uniq' by column? -

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i have .csv file this:

stack2@example.com,2009-11-27 01:05:47.893000000,example.net,127.0.0.1 overflow@example.com,2009-11-27 00:58:29.793000000,example.net,255.255.255.0 overflow@example.com,2009-11-27 00:58:29.646465785,example.net,256.255.255.0 ...

i have remove duplicate e-mails (the entire line) file (i.e. 1 of lines containing overflow@example.com in above example). how use uniq on field 1 (separated commas)? according man, uniq doesn't have options columns.

i tried sort | uniq doesn't work.

sort -u -t, -k1,1 file
  • -u unique
  • -t, comma delimiter
  • -k1,1 key field 1

test result:

overflow@domain2.com,2009-11-27 00:58:29.793000000,xx3.net,255.255.255.0  stack2@domain.com,2009-11-27 01:05:47.893000000,xx2.net,127.0.0.1

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