tldr/pages/common/pv.md

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# 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}}`