Windows PowerShell in Action修订与解答

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"Windows PowerShell in Action Errors, Updates and Clarifications" 该文档是关于《Windows PowerShell in Action》一书的错误、更新和澄清说明，由作者Bruce Payette发布，旨在为读者提供书中已知错误的列表，解答一些普遍关注的问题，以及包含书中未包含的额外材料。这本书是由Manning Publications出版的。第一版的《Windows PowerShell in Action》在2007年2月进行了第一次印刷，随后在同年3月进行了第二次印刷，以便在那时纠正所有已知的错误。自第二次印刷以来，又发现了新的错误，并整合在这个文档中。对于在第二次印刷时已经修正的内容，文档中会特别指出。 Bruce Payette作为微软公司的Windows PowerShell技术负责人，感谢所有对此项工作做出贡献的人，特别是Manning Author Online Forum的成员，这个论坛提供了讨论和反馈的平台。文档包含了以下几个方面的内容： 1. **错误列表**：详细列出了书中发现的错误，帮助读者避免在学习过程中遇到困扰，确保他们获取准确的信息。 2. **读者问题解答**：对读者提出的一般性问题给出了官方的解答，这些问题可能涉及PowerShell的语法、命令用法或特定场景的应用。 3. **示例改进**：根据读者的建议，对书中的某些示例进行了改进，以提高代码的清晰度和效率。 4. **额外材料**：包含了一些原书中因篇幅或其他原因未能包含的附加内容，这些内容可能包括额外的脚本示例、技术解释或者深入的理论知识。通过这份文档，读者可以得到一个更完整、更准确的PowerShell学习资源，同时也能看到作者和社区如何共同努力来完善技术资料。对于正在学习或使用Windows PowerShell的人来说，这是一份非常有价值的参考资料。

+ " "

On page 138, in Table 5.4, the fifth example showing the use of the percentage

formatter, the output column repeats the expression instead of showing the output.

Line should read:

{0:p} Display a number as a percentage. "{0:p}" -f .123 12.30 %

where the output column shows 12.30 % .

Chapter 6

On page 171, in section 6.8.1, in the example showing the use of the Foreach-

Object cmdlet:

1..10 | foreach ($_}

the opening parenthesis ‘(‘ after foreach should actually be an opening brace ‘{‘ as in

1..10 | foreach {$_}

Otherwise you’ll get a syntax error.

Chapter 7

On page 190, in the middle of the page at the end of section 7.2.4, there is a line which

reads, "And if I set a variable in a function, can I still use that function after the script has

exited?". This line should read "...can I still use that variable...".

On page 191, at the top of the page, there is a line which reads, "Function two sets the

variable $x to a particular variable...". This should read "Function two sets the variable

$x to a particular value...".

On page 210, in the middle of the page there's a line which reads:

"The arguments to PowerShell.exe are actually accumulated and then treated as a script

to exit." This statement should read "....treated as a script to execute."

In the summary section for chapter 7, the first bullet on page 213 talks about using the

param keyword in functions but the use of param is never shown with functions, only

with scripts. Here’s how it works:

A typical function is written as

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Thomas_Tian

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