Unix command to change the case of first three lines of file “shortlist” from lower to upper

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Unix command to change the case of first three lines of file “shortlist” from lower to upper

1.$ tr ‘[a-z]’ ‘[A-Z]’ shortlist | head-3

2.$ head-3 shortlist | tr ‘[a-z]’ ‘[A-Z]’

3.$ tr head-3 shortlist ‘[A-Z]’ ‘[a-z]’

4.$ tr shortlist head-3 ‘[a-z]’ ‘[A-Z]’

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