perl -i.bak -pe 's/first/last/g' one.txt

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To make your code work you need to change the order of operators and add 'g' modifier to the regexp 

perl -ni.bak -e 's/first/last/g; print' one.txt

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In reply to Re: How to modify words in a line using perl oneliner by ccn
in thread How to modify words in a line using perl oneliner by Anonymous Monk

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