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Today when reading article which describe how to install Hadoop, the author uses: ssh localhost
what does the command mean?
Below is this article's location? http://codesfusion.blogspot.com/2013/10/setup-hadoop-2x-220-on-ubuntu.html?m=1
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The command means that a connection is conducted to the own machine, to the current user. In general, that means a new login shell with (perhaps) new privileges, when the list of groups the user is member in has changed.
Open the terminal on the server machine. You can either search for “terminal” or press CTRL + ALT + T on your keyboard. Type in ssh localhost and hit enter.
SSH Command in Linux The ssh command provides a secure encrypted connection between two hosts over an insecure network. This connection can also be used for terminal access, file transfers, and for tunneling other applications. Graphical X11 applications can also be run securely over SSH from a remote location.
Looks like a quick way of making sure that 'localhost' is added to the list of known hosts so that a script execution doesn't get interrupted by a question about trusting localhost's authenticity.
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