>perl -Mntheory=:all -nE "chomp; say is_prime($_);" input.txt
Parameter 'inputtxt' must be a positive integer at -e line 1, <> line 1.
>perl -Mntheory=:all -nE "chomp; say length($_);" input.txt
Parameter 'inputtxt' must be a positive integer at -e line 1, <> line 1.