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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                使用 !-e $request_filename 變量 -e表示只要filename存在,則為真,不管filename是什么類型,當然這里加了!就取反 額外的一些 -e filename 如果 filename存在,則為真 -d filename 如果 filename為目錄,則為真 -f filename 如果 filename為常規文件,則為真 -L filename 如果 filename為符號鏈接,則為真 -r filename 如果 filename可讀,則為真 -w filename 如果 filename可寫,則為真 -x filename 如果 filename可執行,則為真 -s filename 如果文件長度不為0,則為真
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