The remote shell is not recognizing the command sent and dying with some signal (probably SIGHUP or SIGPIPE).

Try using CRLF as the line terminator: 

my @output = $ssh->capture({stdin_data => "@cmd\r\n@quitcmd\r\n"});

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Note also, that capture may return some content even when an error is signaled and getting the error OSSH_SLAVE_CMD_FAILED may be non fatal.

In reply to Re^5: How to solve Pseudo terminal issue OpenSSH by salva
in thread How to solve Pseudo terminal issue OpenSSH by waytoperl

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