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Net::SSH::Perl->new( $host, [identity_files => [$keyfile]);

$ perl -MO=Deparse -e 'Net::SSH::Perl->new( $host, [identity_files => 
+[$keyfile]);'
syntax error at -e line 1, near "])"
Missing right curly or square bracket at -e line 1, at end of line
-e had compilation errors.

Net::SSH::Perl->new( $host, [identity_files => [$keyfile]]);

Net::SSH::Perl->new($host, %params)

Net::SSH::Perl->new($host, identity_files => [$keyfile]);