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If you frequently need to connect to your ubersecure mainframe from various uberunsafe machines, you have to face difficult decision: (a) type the password everytime during the session (lame), (b) add local public key to mainframes authorized_keys file (unsafe), (c) as above, but remove this key at the end of the session (pain in the a55). So let's say you save The Command to tempauth file in bin directory of your mainframe's account and make it executable. Then, while you're on one of these unsafe ones, do:
cat $HOME/.ssh/id_rsa.pub|ssh firstname.lastname@example.org bin/tempauth 30
and password prompts stop the harassment for 30 minutes and you don't have to care to remove the unsafe key after that.
There are 10 alternatives - vote for the best!
If you can do better, submit your command here.
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