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use Net::SSH::Any qw();
my $ssh =
  Net::SSH::Any->new( '172.20.251.20', user => 'root', password => 'r3
+v3nue' );
my @tmp = $ssh->capture('ls -lrt');
print " @tmp";

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Use of uninitialized value $tmp[0] in join or string at test.pl line 7.