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Thank you, problem solved!

for word in $(<$f1); do
echo $word | grep "[a-z]"
done

$f1 stores the file name, the problem with my code is that the words are printed on separated lines.

Hello, I have a file containing different words. How can i print the words which contain at least one small letter, for example if i have:

today TOMORROw 12345 123a
next preViou5 no

it should...