choroba's answer should get you past your messages; this comment addresses your approach:

unless (open (QTREES, $file))  {
    print STDERR "WARNING: get_qtrees() can't open $file for filer $fi
+ler!\n";

[download]

is unnecessarily verbose. In the first example, you could achieve the same end with:

unless (open (QTREES, $file) or warn "get_qtrees() can't open $file for filer $filer!\n");

Similarly, in the second,

open (QTREES, $file) or warn "get_qtrees() can't open $file for filer $filer!\n";

In reply to Re: unless vs. bare block by ww
in thread unless vs. bare block by chayashida

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