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Kredns
Asked: 2009-07-10 15:01:49 +0800 CST

How to customize Pipes in Windows?

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I'm console application and want to save the output to a text file. So I do this:

Pi.exe > Pi.txt

Then open the text file and see this:

Calculating Pi to 10,000 decimal places...

Then I se Pi (3.14...)

How can I have the command prompt remove the Calculating Pi to 10,000 decimal places...?

windows windows-7 windows-command-prompt

1 Answers

  1. Best Answer

    If you wrote Pi.exe or can change it, the best two options are

    • Change Pi.exe to take a -q option to run 'quietly'
    • Have Pi.exe output 'Calculating Pi' etc to stderr, instead of stdout

    Otherwise:

    • Pipe through find /v first:

      Pi.exe | find /v "Calculating Pi" > pi.txt

    It will capture only lines that don't contain "Calculating Pi".

    • 2