How to avoid password prompt input with rsync?

You are given a password input prompt when transferring files to a different server with rsync.

$ rsync -avz /data root@srv::files Password:

There are two ways to use the RSYNC_PASSWORD environment variable and the –password-file option.

Using the environment variable

$ export RSYNC_PASSWORD=secret $ rsync -avz /data root@srv::files or $ RSYNC_PASSWORD=secret rsync -avz /data root@srv::files

Using the command option

$ echo Passw0rd > user2.secret $ chmod 600 user2.secret $ rsync -avz –password-file user2.secret /data root@srv::files

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