[counting vowels]
grep -io [aeiou] a.sh | wc -w
cat a.sh | tr 'bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ1234567890()~`!@#$%^&*"()_+{}|:"<>?,./;][=-' ' ' | grep -io [aeiou] | wc -w
[counting only a ]
grep -io [aeiou] a.sh | grep a | wc -w
grep -io a a.sh | wc -w
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