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How to avoid password prompt input with rsync?

by Albert

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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