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Re: Re: Re: Re: Re: system & shell metacharacters

by vek (Prior)
on Jul 23, 2003 at 18:14 UTC ( #277288=note: print w/replies, xml ) Need Help??

in reply to Re: Re: Re: Re: system & shell metacharacters
in thread system & shell metacharacters

Using || die is fine as long as parens are used.
open(FOO, $file) || die "Couldn't open $file - $!\n";

When no parens are present, you should use or die instead.

Personally, I always use parens everywhere so my code is littered with || dies.

-- vek --

Replies are listed 'Best First'.
|| die or or die :)
by snax (Friar) on Jul 23, 2003 at 20:00 UTC
    I'm just surprised that I've never seen a problem using it exactly as I've written it above, which I do with great regularity. The docs say that the calling signatures are
    My syntax falls into the first case, but what constitutes an "EXPR"? I've got a string, the || operator, then the die -- does that qualify as an EXPR? I'll have to poke around the docs some more.....

    Oh. Playing around with the right and wrong way shows me that my "|| die" syntax fails without die-ing.

      I've got a string, the || operator, then the die -- does that qualify as an EXPR?
      Yes, it does (as you seem to have discovered): since || is higher precedence than the comma, it's parsed roughly as open ( FILEHANDLE, ("filename" || die( ...) ) ); Since your string is always true, the die is never reached.

      If God had meant us to fly, he would *never* have given us the railroads.
          --Michael Flanders

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