[LIH] printing lines having same words

Hi,

How can i refer the  second field of a line , I need
to filter out those lines in which the second field is
same .

The second field can be anything , it is not fixed ,
like the example file is like:

0001:1947:a:b:c:g:h
0001:19471:g:h:j:l:o
0001:1947:g:e:f:n:h

for example I want to print the first and third lines
, as the second field is same i.e 1947.

but the value of second field is not known , just that
the second field is same .

How can I parse that type of file.

Br//
Anuraag. 


      

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