regex - Vim EX command to remove non-duplicate records -

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i have large file trying reduce neighboring duplicated record id lines. (it's been sorted already)

example:

ab12345  10987654321 andy   male ab12345  10987654321 andrea female cd34567  98765432100 andrea female ef45678  54321098765 bobby  tables

should remove lines 3-4 leaving lines 1-2.

the following regex pattern finds duplicate lines successfully, subsequent command removes not of non-matching lines.

:/\v^(\a{2}\d{5}\s{2}\d{11}).*\n(\1.*)+ :g!/\v^(\a{2}\d{5}\s{2}\d{11}).*\n(\1.*)+/d

why aren't non-matching lines being deleted?

not vim solution, should work:

$ fgrep -f <(awk -v ofs=' ' '{print $1, $2}' data.txt | sort | uniq -d) data.txt

the <(...) bashism, , osf=' ' has 2 spaces.


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