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32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
# pv
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> Monitor the progress of data through a pipe.
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> More information: <https://manned.org/pv>.
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- Print the contents of the file and display a progress bar:
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`pv {{path/to/file}}`
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- Measure the speed and amount of data flow between pipes (`--size` is optional):
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`{{command1}} | pv {{[-s|--size]}} {{expected_amount_of_data_for_eta}} | {{command2}}`
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- Filter a file, see both progress and amount of output data:
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`pv {{[-cN|--cursor --name]}} in {{path/to/file.txt}} | grep {{pattern}} | pv {{[-cN|--cursor --name]}} out > {{path/to/filtered_file.txt}}`
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- Attach to an already running process and see its file reading progress:
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`pv {{[-d|--watchfd]}} {{PID}}`
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- Read an erroneous file, skip errors as `dd conv=sync,noerror` would:
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`pv {{[-EE|--skip-errors --skip-errors]}} {{path/to/faulty_media}} > {{path/to/image.img}}`
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- Stop reading after reading specified amount of data, rate limit to 1K/s:
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`pv {{[-L|--rate-limit]}} {{1K}} {{[-S|--stop-at-size]}} {{maximum_file_size_to_be_read}}`
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- Calculate hash (MD5, SHA1, SHA256, etc) of a large file and show progress:
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`pv {{path/to/file}} | {{sha256sum}}`
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