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[user@server1]$ tar -czvf - web/ | ssh user@server2 'rm -rf web/ ; tar
+ -xzvf -'

ssh implements the RSA authentication protocol automatically. The user
creates his/her RSA key pair by running ssh-keygen(1). This stores the
...
lines can be very long). After this, the user can log in without givin
+g
the password. RSA authentication is much more secure than rhosts authe
+n­
tication.