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my @nodes = (
              { host      => "somenode1.domain.local",
...
              }
              # ...
            );

my @CONNECTCOMMANDS;
for my $host (@nodes) {
     push @CONNECTCOMMANDS, "$SSHCOMMAND -ssh $host->{username}\@$host
+ -pw $host->{password}";
}

my @connection_commands = (
     'plink.exe -ssh user1@somenode1.domain.local -pw password1',
     'plink.exe -ssh user2@somenode2.domain.local -pw password2',
     # ...
     );