Update cheatsheets

pv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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}}`