Supply password to rsync

Via environment variable

Use environment variable RSYNC_PASSWORD to provide password to rsync command

export RSYNC_PASSWORD=$PASSWORD
rsync -zvr source destination

or

env RSYNC_PASSWORD=$PASSWORD rsync -zvr source destination

Via password file

rsync --password-file=rsync_pass -zvr source destination

Some other methods

Such as sshpass and public key.

References

How can I rsync without prompt for password, without using public key authentication?