python - How to pass echo y to plink.exe for first connection

Question

I would like to pass echo y to plink.exe, so that plink execute a command. How it can be achieved?

os.system(' c:/netapp/python/plink.exe [email protected] -pw xxx  uptime > c:/netapp/python/12.txt')

The server's host key is not cached in the registry. You have no guarantee that the server is the computer you think it is. The server's rsa2 key fingerprint is: ssh-rsa 2048 9d:08:37:a8:d0:34:a3:d2:d8:e5:09:7e:63:08:a9:1b If you trust this host, enter "y" to add the key to

Store key in cache? (y/n)

Answer 1

Do not!

Verifying host key fingerprint is an integral part of securing your connection. Blindly accepting any host key will make you vulnerable to the man-in-the-middle attacks.

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Instead, use the -hostkey switch to provide the fingerprint of the expected/known host key.

c:/netapp/python/plink.exe [email protected] -pw xxx -hostkey 9d:08:37:a8:d0:34:a3:d2:d8:e5:09:7e:63:08:a9:1b your command here

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Do not use hacks like feeding y to Plink input. Not only it is insecure. But if there is no host key prompt (because the host key is already cached), the y will end up as an input to the command you are executing. What may lead to undesired results.