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Editorial Team
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Asked: 2026-05-15T05:27:10+00:00

A powershell question: I want to extract each line in a character stream produced

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A powershell question: I want to extract each line in a character stream produced by an application that matches a certain pattern which in pseudo-code would be something like this:
PS> <a_ps_command> <the_application_command_for_outputting_the_text_stream> | <my_filter > output_file.txt

In my case the application is a CM-tool that outputs the change history of a source file and the (psuedo)pattern should be something like:
<a couple of numbers><a name><a time stamp><a line of characters>

Cheers,
Christian

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1 Answer

  1. Editorial Team

    The filtering cmdlet in PowerShell is Where-Object (aliases Where and ?). You simply pass the output of the SCM command into it. You then use $_ to represent the current line and test against it e.g.:

    tf hist .\Settings.StyleCop /i /stopafter:20 | Where {$_ -match '^\d+.*?Hack'}

    The -Match operator is used to compare the current line of output against a regex. I use ^\d+ to filter out the first two lines of tf hist output (which are formatting strings) and then I search on the text Hack anywhere else on the line (looking for it in comments for instance). You would modify and enhance the regex to meet your needs.

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