open BAR, '|bar.pl' || die qq(Useful msg: $!);

... is wrong, because it is interpreted as:

open BAR, ('|bar.pl' || die qq(Useful msg: $!));

... so remember to use "or die" rather than "|| die".

In reply to Re: Re: Re: system & shell metacharacters by bunnyman
in thread system & shell metacharacters by Anonymous Monk

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