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I'm not sure what your definition of relatively new is, but qx has existed since at least 5.8.8 (oldest Perldoc readily available on perldoc.perl.org) and 5.8.8 was released over 10 years ago (2006-Jan-31).

In reply to Re^2: qx not always capturing stdout by Paladin
in thread qx not always capturing stdout by StuLong

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