awk - Keep only the line that is latest in the file and is a duplicate based on two fields -


this related questions

i have file this:

foo,bar,100,200,300 baz,taz,500,600,800 foo,bar,900,1000,1000 here,there,1000,200,100 foo,bar,100,10000,200 baz,taz,100,40,500

the duplicates determined first 2 fields. in addition, more "recent" record (lower in file / higher line number) 1 should retained.

what awk script output:

baz,taz,100,40,500 foo,bar,100,10000,200 here,there,1000,200,100

output order not important.

explanation of awk syntax great.

this might work (tac , gnu sort):

tac file | sort -sut, -k1,2

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