# 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 {{[-s|--size]}} {{expected_amount_of_data_for_eta}} | command2`

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

`pv {{[-cN|--cursor --name]}} in {{big_text_file}} | grep {{pattern}} | pv {{[-cN|--cursor --name]}} out > {{filtered_file}}`

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

`pv {{[-d|--watchfd]}} {{PID}}`

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

`pv {{[-EE|--skip-errors --skip-errors]}} {{path/to/faulty_media}} > image.img`

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

`pv {{[-L|--rate-limit]}} 1K {{[-S|--stop-at-size]}} {{maximum_file_size_to_be_read}}`