When using the COSCMD tool to download files from Tencent Cloud Object Storage (COS), you might encounter duplicate files, especially if you're synchronizing directories or have multiple versions of the same file. To skip duplicate files during the download process, you can use the --skip-existing option.
Here's how you can use it:
coscmd download --skip-existing /source/path/in/cos /destination/path/on/local
This command tells COSCMD to skip any files that already exist in the destination directory, thus preventing duplicates.
Example:
Suppose you have a directory on COS named photos/2023 and you want to download these photos to your local directory ~/Pictures/2023. If some photos already exist in your local directory, you can use the following command:
coscmd download --skip-existing photos/2023 ~/Pictures/2023
This will download only the new or updated files from photos/2023 on COS to ~/Pictures/2023 on your local machine, skipping any files that are already present and identical.
For more advanced scenarios, such as handling files with different timestamps or versions, you might need to use additional options or scripts to manage the synchronization process more precisely. Tencent Cloud COS also provides APIs and SDKs that offer more control over file operations, which can be useful for complex synchronization tasks.