shell script rsync password file option

In a shell script how to use rsync --password-file option

rsync -a r开发者_开发技巧oot@123.123.12.3:/root /backup

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If protocol is rsync you can use:

rsync -a --password-file=/path/to/secret rsync://root@123.123.12.3/root /backup

If rsync over ssh used, you should setup public key ssh auth. On local host run

ssh-keygen -t rsa -b 1024

then add content of ~/.ssh/id_rsa.pub to ~/.ssh/authorized_keys on remote host.