Why is the number of layers of redirection an argument against backticks

Sorry, must be a misunderstanding. Of course backticks operator and open call are equivalent. I meant to say that the extra subroutine adds a layer. And unless the external command is trivial or absolutely, totally predictable, this comes in handy to instrument it. At least that is my experience. That's why I normally code a wrapper around system calls. More than one way etc...

In reply to Re^4: capturing command output by pklausner
in thread capturing command output by morgon

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