使用多个 `rsync` 无需等待完成

Question

I have this code below which loops rsync several times in different directories:

for (( i=0; i<6; i++ )); do

    rsync /source-${i} /remote-destination
    
done

However there is a problem: when it executes the first rsync , it asks me the password of the remove server and then it starts transfering the files. Only after it finishes transfering all the files it executes the loop a second time, asks me the password of the remote server again (no problem, I can afford typing the password every single time) and then I need to wait the transfer to happen so it can continue.

I would like the loop to continue, without waiting... I tried using the & char at the end of the command line to send it to background however if I do that, I cant type the password of the remote server!

Any idea how I can solve this? I really want to type myself the password every single time, this is not a problem. The problem is that or the loop waits every single rsync to be completed or it sends the password prompt to the background if I use & .

Answer 1

Look into the rsync online man page , and it has an opinion called --password-file .

Here are some original texts:

You can avoid the password prompt by setting the environment variable RSYNC_PASSWORD to the password you want to use or using the --password-file option. This may be useful when scripting rsync.

Answer 2

This is really an ssh question. You have to create ssh keys and copy them to the remote host - see here for some good directions.

Until you can do:

$ ssh remotehost hostname
remotehost

without entering a password rsync will require a password.