Monitor dd command progress with status=progress
dd if=/dev/urandom of=/dev/null status=progress
Runs the dd command to read from /dev/urandom and discard the output, while showing a progress bar that updates in real-time. The status=progress option (available from GNU Coreutils 8.24 released in June 2015) provides a running status of how much data has been processed, useful for long-running data transfers.