'chop' functiononly removes the last character completely 'from the scaler, where as 'chomp' function only removes the last character if it is a newline. by default,
chomp only removes what is currently defined as the $INPUT_RECORD_SEPARATOR.
whenever you call 'chomp ', it checks the value of a special variable '$/'. whatever the value of '$/' is eliminated from the scaler. by default the value of '$/' is '\n'
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