Linux rsync 命令

Question

I work now with a Linux Server and an Apple Mac. Each morning I update my data on my MacBook with the command rsync -a -v server:~/work_dir ~/ . I looked up the manual already, but I can not found any command which helps me. Because I wanted the command to delete the files which are not any more on the server automatically. But when I delete a file on the server and run the rsync command, the files is still on my laptop. Do I use the wrong command? Or do I miss an option?

Answer 1

If your script is adapted to look like this,

MASTER="server:${HOME}/work_dir"
REPLICA="${HOME}/"

rsync --archive --delete --verbose "${MASTER}" "${REPLICA}"

the --delete option will delete any files existing in REPLICA that do not exist in MASTER. I will assume you meant to have rsync create the directory "work_dir" in your laptop ${HOME} if it did not exist. Otherwise, as a failsafe, I would create "work_dir" on the laptop and add the trailing "/" to the MASTER definition.

Note that there are many modes of behaviour for that delete action, controlling the timing of when the delete occurs.

I recommend against using

--delete-before
--delete-during

unless the REPLICA is a folder intended as a handoff buffer for other downstream processes .

If REPLICA is intended to be a duplicate of MASTER, then it is highly recommended that you use the delete o ptions which preserve all data until after the copying has been verified as good. That leaves you with the two options

--delete-delay
--delete-after

of which the --delete-delay is likely the preferred choice because it won't force a second scan of the REPLICA to locate the files to be purged.