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Please help to figure this out . I couldn't find it in man file , what exactly "-" does here?

Thank you, sorry for being silly.

tar cf - B | gzip - > B.tar.gz
hello kitty
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    I too couldn't find it in `man tar`, the man page could be improved. But `man gzip` states: `If no files are specified, or if a file name is "-", the standard input is compressed to the standard output.` – KamilCuk Sep 26 '20 at 19:58

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