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perl -le 'BEGIN{$,=","} print map int rand 1000, 1..2500 for 1..547_18
+3' > infile.csv

...
[sk]% time perl -nle '$line++; print +($line-1) if eof;' infile.csv
547183
19.600u 4.560s 0:24.16 100.0%

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% head -10000 inputfile > smallfile

% script smallfile