errorlevel（終了コードを取得する）
Errorlevel returned as exit code when executing bat step
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Set errorlevel in Windows batch file - Stack Overflow
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Batch Cheat Sheet by ChaosJD - Download free from Cheatography - Cheatography.com: Cheat Sheets For Every Occasion
Batch File to Ping
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Batch - how to use errorlevel - YouTube
Errorlevel of the Par2 Files Batch file · Issue #43 · Yutaka-Sawada/MultiPar · GitHub
batch file - .bat and .cmd different on ERRORLEVEL, who determines SET's behavior? - Stack Overflow
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