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close_slave_pty => 0
When a pseudo pty is used for the stdin stream, the slave side is auto
+matically closed on the parent process after forking the ssh command.

This option disables that feature, so that the slave pty can be access
+ed on the parent process as $pty->slave. It will have to be explicitl
+y closed (see IO::Pty).

    
If you don't close channels/connections, they will be automatically cl
+osed for you from the objects destructors when they go out of scope. 
+The advantage of doing it explicitly is that you can catch errors.