file - Check how many "," in each line in Perl -

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this question has answer here:

i have check how many times "," in each line in file. have idea how can in perl?

on moment code looks it:

open($list, "<", $student_list) while ($linelist = <$list>) {    printf("$linelist"); } close($list)

but have no idea how check how many times "," in each $linelist :/

use transliteration operator in counting mode:

my $commas = $linelist =~ y/,//;

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