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並前往https://www.generacodice.com/en/articolo/3397082/check-a-string-for-a-substring-in-a-batch-file-windows

Check a string for a substring in a batch file (Windows)?

(or on) if $1 is undefined, whereas ECHO(!$1! will echo a blank line if undefined. FINDSTR will echo $1 if it finds the search string - you don't want that so ...

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