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#!/usr/bin/perl
use strict;
use warnings;
...
        }
        );
}

#!/usr/bin/perl
use strict;
...
{
        $pssh->add_host($host,user =>'root',passwd=>'access') or print
+ "Error----\n";
}

[root@station20 cgi-bin]# perl NetOpenSSHParallel.pl 
Error----
Error----