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perl -lne '$n=tr/,//;$h{$n}++;END{print "$h{$_} rows have $_ commas" f +or (keys %h)}' some_file.csv
split(",")
split( /,/, $_, -1 );
@array = split( /,/, "field1,field2,,field4,field5,,," );
( 'field1', 'field2', undef, 'field4', 'field5' );
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