First will print line No if numericaly equal or string equal, second only for lines with equal numbers 

perl -ne 'print $. if /^(.+)\s+\1$/'

perl -ne 'print $. if /^(\d+)\s+\1$/'

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Cheers,
R.

In reply to Re: printing line number by Random_Walk
in thread printing line number by Anonymous Monk

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