在 2019-05-27 7:13, Cameron Simpson 写道:
On 26May2019 22:55, Fc Zwtyds <fczwt...@gmail.com> wrote:
 I am using cygwin on Windows 8.1. These two commands work fine in  cygwin:
ssh-agent -s
ssh-add ~/.ssh /id_rsa

No, they run without error (apparently). That is  an entirely different thing.

In particular, "ssh-agent -s" starts an agent but unless you make use of its output, your subsequent commands will have no idea how to access it.

Since ssh-add (apparently) works, then I would guess you _already_ had an agent, and it is adding to that agent's keys. And, importantly, _ignoring_ the new agent you started.

Try running your commands above again, but _before_ them, run "ssh-add -l". If that works then there's already an agent known to the shell and your subsequent "ssh-add" is likely adding to that, not to the new agent you dispatched.

 I tried to use them on windows cmd and it worked fine. Now I am going to use python to write code to implement the above command.
os.system('ssh-agent -s')
os.system('ssh-add id_rsa')
There was an error:
Could not open a connection to your authentication agent.

I'm presuming that as with UNIXy systems, os.system() on Windows issues its commands to a distinct shell ( instance of cmd.exe or the like).

As such, since you've made no effort to catch and parse the output of "ssh-agent -s" you don't know how to talk to the agent you started, and further since you don't pass any information to the shell running "ssh-add" then it doesn't know how to do that either.

Cheers,
Cameron Simpson <c...@cskk.id.au>

Thank you very much for your detailed answer.
I will try to learn how to capture and parse the output of "ssh-agent -s" and learn how to talk to the agent.

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