This article was previously published under Q135268
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NOTE: This article only applies to English language versions of Windows.
The CACLS.EXE command line utility does not provide a /Y switch thatautomatically answers with Y for Yes to the ARE YOU SURE? Y/N prompt.However, you can use the echo command to pipe the character Y as input tothe ARE YOU SURE? Y/N prompt when you call Cacls.exe in a batch file.
To programmatically answer with Yes to the ARE YOU SURE? Y/N prompt duringbatch file execution, use the following command line in your batch file:
echo y| cacls filename /g username:permission
NOTE: Do not type a space between the "y" and the pipe symbol (|),otherwise, Cacls.exe fails to make the permission changes.
In larger batch files, this may produce the following error before continuing to the next line:
The Process tried to write to a nonexistent pipe.
The echo command does not expel its output before the system has a chance to build the pipe to cacls. There are different ways to work around this.
As an alternative, you can create a dummy file with just a "y" in it and use the syntax:
Microsoft Windows 2000 Server, Microsoft Windows 2000 Advanced Server, Microsoft Windows 2000 Professional Edition, Microsoft Windows NT Server 3.5, Microsoft Windows NT Server 3.51, Microsoft Windows NT Server 4.0 Standard Edition, Microsoft Windows NT Workstation 3.5, Microsoft Windows NT Workstation 3.51, Microsoft Windows NT Workstation 4.0 Developer Edition