pv

Monitor the progress of data through a pipe. More information: https://manned.org/pv.

• Print the contents of the file and display a progress bar:

pv path/to/file

• Measure the speed and amount of data flow between pipes (--size is optional):

command1 | pv --size expected_amount_of_data_for_eta | command2

• Filter a file, see both progress and amount of output data:

pv -cN in big_text_file | grep pattern | pv -cN out > filtered_file

• Attach to an already running process and see its file reading progress:

pv -d PID

• Read an erroneous file, skip errors as dd conv=sync,noerror would:

pv -EE path/to/faulty_media > image.img

• Stop reading after reading specified amount of data, rate limit to 1K/s:

pv -L 1K --stop-at --size maximum_file_size_to_be_read