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Adding to the above corrections, use "-lt" instead of "<".
Also the script you wrote will be in an infinite loop. There will be no changes to $a and $b since $drop is always equal to zero....

16 ) you hit null results since you have explicitly escaped the *. It makes the grep command to look for actual 'asterix' in the words.

instead of ::
grep -i '^\(\w\)\(\w\)\(\w\)\w\*/\3/\2/\1$'...