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#including code for debugging
$Net::OpenSSH::debug = ~0;

[root@server-01 perl_script]# perl perl_script4.pl 
# open_ex: ['ssh','-V']
...
# master 31783 exited, rc:65280, err: 
# master state jumping from _STATE_KILLING to _STATE_GONE
[root@server-01 perl_script]#