How to test if STDIN is terminal in batch?

大憨熊 提交于 2019-12-01 06:13:05

EDITED - Thank you to all the testers.

@echo off
    timeout 1 2>nul >nul
    if errorlevel 1 (
        echo input redirected
    ) else (
        echo input is console
    )

The timeout command tries to directly get access to the console, and this will fail if the batch file is executed as

myBatchFile.cmd < input.txt
echo something | myBatchFile.cmd

Tested on Windows XP (timeout from W2003 Resource Kit), 7 and 8.1.

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