Windows terminal not recognizing "<" operator for file redirection [duplicate]

Question

I am trying to write a program where I have to use file redirection to cin text from another text file. I'm seeing that I should be able to use .\a.exe < inputFile.txt, but for whatever reason my windows terminal does not recognize "<". This is the error I got :

At line:1 char:14
+ .\a.exe 1000 <input1L.txt
+              ~
The '<' operator is reserved for future use.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : RedirectionNotSupported

I don't know why it's not recognizing it and I don't know how to fix it.

That looks like a PowerShell error message, not a "normal" command-prompt ("DOS prompt") error message. — Some programmer dude
– Some programmer dude, Commented Nov 25, 2019 at 14:56
@DiegoBascans That re-directs output to a file. Anyway, this is a dupe. — sweenish
– sweenish, Commented Nov 25, 2019 at 15:02
@DiegoBascans < is commonly used for input redirection, to redirect standard input from a file. Except in PowerShell, apparently. — Some programmer dude
– Some programmer dude, Commented Nov 25, 2019 at 15:02

Bill_Stewart · Accepted Answer · 2019-11-25 15:25:44Z

2

As the error message says, the < operator isn't implemented, but in practice you can work around this by piping (|) instead.

In your example, instead of this:

.\a.exe 1000 <input1L.txt

You should be able to write this:

Get-Content input1L.txt | .\a.exe 1000

(presuming your .\a.exe accepts standard input).

answered Nov 25, 2019 at 15:25

Bill_Stewart

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