Why are the terminal command parameters of mac basically two "-"?

such as svnserve-- version

Swift objective-c python java
Mar.10,2021

single "-" there are also many
svnserve help documentation

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by the way, you can learn about the acquisition and implementation of long and short parameters in the program
link

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-4369a95-15e8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-4369a95-15e8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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