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i want to run a sript that is present in local machine,but it should perform operations on remote machine.

i have already generated public-private keys,so no password authentiaction is required.

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Run the shell on the other side, and send the script through.

ssh user@host bash <
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is it bash or 'bash -s'? – sam Feb 14 '11 at 11:46
-s is not required except under specific conditions. – Ignacio Vazquez-Abrams Feb 14 '11 at 11:49

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