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#!/usr/bin/perl
  
...
 
#close the ssh session
undef $ssh;

# open_ex: ['ssh','-O','check','-T','-S','/root/.libnet-openssh-perl/u
+ser-10.253.10.10-25248-962213','-l','user','10.253.10.10','--']
# _waitpid(25251) => pid: 25251, rc: 0, err:
...
Couldn't run remote command: child exited with code 255 at script.pl l
+ine 42.
# open_ex: ['ssh','-O','exit','-T','-S','/root/.libnet-openssh-perl/us
+er-10.253.10.10-25248-962213','-l','user','10.253.10.10','--']
# _waitpid(25253) => pid: 25253, rc: 0, err: