Mac sync folders terminal l
You can however build yourself a sync command using rsync and a bit POSIX shell scripting which gets already very close to a sync tool as described above. rsync has no such log, it only relies on the current file state of two sides of the operation. By storing all log entries with timestamps, it's even possible that a deleted file comes back and gets deleted multiple times yet the sync tool will always know what to do and the result is always correct. If there never was such a file according to the log, it must be synced. If that log reveals that there once was a file and has been synced but now it is missing, it's clear that it has been deleted. Sync tools that can reliably sync deleted files usually manage a sync log about all past sync operations.
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Why? Has it never existed at the destination or has it been deleted? Both cases look identical to rsync. It won't help to sync the other way round as that can lead to the same situation: A file exists at the source but not at the destination.
MAC SYNC FOLDERS TERMINAL L HOW TO
These two situations look identical to rsync thus it cannot know how to react correctly. Handling deletes is not easily possible as consider the following situation: A file has been deleted at the source, now how shall rsync know if that file once existed and has been deleted (in that case it must be deleted at the destination as well) or whether it never existed at the source (in that case it must be copied from the destination). Please note that this solution cannot handle deleted files. Without -u rsync would sync regardless if a file/folder is newer or not. Other answers here seem to overlook that sometimes the content of a file stays unchanged but its owner may have changed or its access permissions may have changed and in that case rsync would not sync the file which could be fatal.īut you also require -u as that tells rsync to completely leave any file/folder alone, in case it exists already at the destination and has a newer last modification date.
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-D Also sync special (not regular/meta) filesīasically whenever you want to create an identical one-to-one copy using rsync, you should always use -a as that's what most users expect to happen when they talk about " syncing".a (a for archive) is a shortcut for -rlptgoD: You need to run rsync twice and I recommend to run it with -au: rsync -au /local/source/* /remote/destination