But as it, it's an example of cargo-cult. Sure, $res is true if and only if the eval doesn't fail, but you're not using its result. Instead, you rely on $@ to determine failure. But the entire '; 1' idiom is there because relying on $@ to determine failure can trigger both false positives and false negatives. The correct idiom is: 
my $res = eval {...statements...; 1};
unless ($res) {
    ... eval failed ...
}

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In reply to Re^4: Net::SSH2 test connection to remote host by JavaFan
in thread Net::SSH2 test connection to remote host by james_

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