29 Oct
2009
29 Oct
'09
11:26 a.m.
From: John Doe jdmls@yahoo.com
A quick and dirty example (only prints the extra duplicate lines; not the original duplicate): awk -F: ' { v[$3]=v[$3]+1; if (v[$3]>1) print $0; } ' datafile
Here's the version will the 1st duplicate included: awk -F: ' { v[$3]=v[$3]+1; if (v[$3] == 1) { f[$3]=$0; } else { if (v[$3] == 2) print f[$3]; print $0; } } ' datafile