FAQ 5.3: How do I count the number of lines in a file?

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5.3: How do I count the number of lines in a file?

    One fairly efficient way is to count newlines in the file. The following
    program uses a feature of tr///, as documented in perlop. If your text
    file doesn't end with a newline, then it's not really a proper text
    file, so this may report one fewer line than you expect.

        $lines = 0;
        open(FILE, $filename) or die "Can't open `$filename': $!";
        while (sysread FILE, $buffer, 4096) {
            $lines += ($buffer =~ tr/\n//);
        close FILE;

    This assumes no funny games with newline translations.


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