> I don't want every single machine I use to be able to authenticate as me to anyone else. There is the `-c` option to `ssh-add` for that reason: -c

> I don't want every single machine I use to be able to authenticate as me to anyone else. There is the `-c` option to `ssh-add` for that reason: -c Indicates that added identities should be subject to confirmation before being used for authentication. Confirmation is performed by ssh-askpass(1). Successful confirmation is signaled by a zero exit status from ssh-askpass(1), rather than text entered into the requester.