Re^3: Search and replace in all odd lines

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perl -i.bak -nle 's/search/replace/g unless $. & 2; print' file

line 1
line 2
...
line 7
line 8
line 9

$ perl -nle 'print unless $. & 2;' lines.txt
line 1
...
line 5
line 8
line 9

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