Not possible through cp, but one may use rsyncinstead.
Limit is in kb/s.
The additionnal flag --progress may be used if needed.
rsync -av --bwlimit=5000 $UNXDOWN/<path>/ .
Limiting bandwidth while copying
- SR-G
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- 1 minute de lecture
Quick note about limiting copy rate while copying under linux from one folder to another one.