[bash] Speed up rsync with Simultaneous/Concurrent File Transfers?

You can use xargs which supports running many processes at a time. For your case it will be:

ls -1 /main/files | xargs -I {} -P 5 -n 1 rsync -avh /main/files/{} /main/filesTest/

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Speed up rsync with Simultaneous/Concurrent File Transfers?