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Introduction to Command Line & Batch files
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Create a batch file that will log the time & date of your internet disconnection or reconnection - VisiHow
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コマンドが失敗したときに異常終了しましたと表示させたいとき~errorlevel - Qiita
How tp faild the step when batch script return %errorlevel% otherthen 0 - Execution - Octopus Deploy
Introduction to Command Line & Batch files
cmd - ERRORLEVEL cannot report regsvr32's process exit code, why? - Stack Overflow
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errorlevel（終了コードを取得する）
errorlevel（終了コードを取得する）
Batch - how to use errorlevel - YouTube
Windows Batch File Tips and Tricks - PushMon - Script, App, Batch & Cron Job Monitoring - Push Monitoring
Archived News from Rob van der Woude's Scripting Pages, 2014 Q3
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Return Error Level
windows - "IF ERRORLEVEL" chain sets wrong value - Stack Overflow
Introduction to Command Line & Batch files
