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say "sed -ie 's/\(.*\)/Number => \1/' test.txt";
say qq{sed -ie 's/\(.*\)/Number => \1/' test.txt};
say q{sed -ie 's/\(.*\)/Number => \1/' test.txt};
...
sed -ie 's/(.*)/Number => /' test.txt
sed -ie 's/(.*)/Number => /' test.txt
sed -ie 's/\(.*\)/Number => \1/' test.txt