删除CSV行

Question

How would I go about deleting a specific number of rows from a large csv file? ie, I am looking to delete the first 100 rows from a file containing over 200,000 rows. Just curious to see if there is another way to handle things other than completely re-writing the file to a temp file and back to overwrite the original file.

Thanks in advance for any help/suggestions.

Answer 1

Does it need to be in php?

You can use the unix command tail to print every line in a file starting from the nth line:

tail -n +101 file.csv > trimmed.csv

Or using PHP:

$lines = file('file.csv'); // read file as array of lines $trimmed = array_slice($lines, 100); // slice array at index file_put_contents('trimmed.csv', implode($trimmed)); // implode and write to file