ForEach-Object confusion in Visual Basic .NET

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13.5.4 ForEach-Object confusion
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The ForEach-Object cmdlet has a punctuation-heavy syntax, and adding in a method s own syntax can create a pretty ugly command line. Here are some tips for breaking any mental logjams:
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Try to use the full cmdlet name instead of its % or ForEach alias. The full name can be easier to read. If you re using someone else s example, replace aliases with the full cmdlet names. The script block enclosed in curly braces executes once for each object that s piped into the cmdlet. Within the script block, the $_ represents one of the objects that was piped in. Use $_ by itself to work with the entire object that was piped in; follow $_ with a period to work with individual methods or properties. Method names are always followed by parentheses, even if the method doesn t require any parameters. When parameters are required, they re delimited by commas and included within the parentheses.
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13.6 Lab
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See if you can answer the following questions and complete the specified tasks. This is an especially important lab, because it draws on skills that you ve learned in many previous chapters, and that you should be continuing to use and reinforce as you progress through the remainder of this book.
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What method of a ServiceController object (produced by Get-Service) will pause the service without stopping it completely What method of a Process object (produced by Get-Process) would terminate a given process What method of a WMI Win32_Process object would terminate a given process Write four different commands that could be used to terminate all processes named Notepad, assuming that multiple processes might be running under that same name.
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Security alert!
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By now, you ve probably started to get a feel for how powerful PowerShell can be and started wondering if maybe all of that power might be a security problem. Of course it might be! My goal in this chapter is to help you understand exactly how PowerShell can impact security in your environment, and to show you how PowerShell can be configured to provide precisely the balance of security and power that you require.
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14.1 Keeping the shell secure
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When PowerShell was introduced in late 2006, Microsoft didn t exactly have a spotless record on security and scripting. After all, VBScript and Windows Script Host (WSH) were probably two of the most popular virus and malware vectors of the time, serving as entry points for such popular viruses as I Love You, Melissa, and many others. When the PowerShell team announced that they were creating a new command-line shell that would offer unprecedented power and functionality, and would offer scripting capabilities, I m sure alarms went off, people were evacuated from buildings, and everyone gnashed their teeth in dismay. But it s okay. PowerShell was created after the famous Trustworthy Computing Initiative that Bill Gates started within Microsoft. That initiative had a real effect within the company: each product team is required to have a skilled software security expert sit in on their design meetings, code reviews, and so forth. That expert is referred to as and I m not making this up the product s Security Buddy. PowerShell s Security Buddy was one of the authors of Writing Secure Code, Microsoft s own bible for writing software that s less easily exploited by attackers. You can be assured that PowerShell is as secure as any such product can possibly be at least,
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Windows PowerShell security goals
it s that secure by default. Obviously, you can change the defaults, but when you do so, you should consider the security ramifications, not just the functional ones. That s what this chapter is going to help you do.
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