explainshell.com - match command-line arguments to their help text
https://explainshell.com/
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explainshell.com - tar zcf - some-dir | ssh some-server "cd /; tar xvzf -"
https://explainshell.com/explain?cmd=tar%20zcf%20-%20some-dir%20%7C%20ssh%20some-server%20%22cd%20/%3B%20tar%20xvzf%20-%22