open RES, "-|", "ls -lde $_";

You have to pass the arguments separately: 

open RES, '-|', 'ls', '-lde', $_
    or die "Cannot launch ls: $!";

[download]

See also: open, perlopentut

Perl 6 - second systems done right

In reply to Re: Shell characters coming back to bite me. by moritz
in thread Shell characters coming back to bite me. by mull

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