blocks|key|296785|text|使用(V3版本)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296786|(Get-Content+c:\temp\test.txt).replace('[MYID]',+'MyValue')+%7C+Set-Content+c:\temp\test.txt|code-block|syntax|javascript|296787|或者对于V2：|296788|(Get-Content+c:\temp\test.txt)+-replace+'\[MYID\]',+'MyValue'+%7C+Set-Content+c:\temp\test.txt|296789|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Use (V3 version):

<pre><code>(Get-Content c:\temp\test.txt).replace('[MYID]', 'MyValue') | Set-Content c:\temp\test.txt
</code></pre>

Or for V2:

<pre><code>(Get-Content c:\temp\test.txt) -replace '\[MYID\]', 'MyValue' | Set-Content c:\temp\test.txt
</code></pre>

blocks|key|296894|text|上面的那个只对“一个文件”运行，但是你也可以在你的文件夹中运行多个文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296895|Get-ChildItem+'C:yourfile*.xml'+-Recurse+%7C+ForEach+{
+++++(Get-Content+$_+%7C+ForEach++{+$_+-replace+'[MYID]',+'MyValue'+})+%7C
+++++Set-Content+$_
}|code-block|syntax|javascript|296896|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The one above only runs for "One File" only, but you can also run this for multiple files within your folder:

<pre><code>Get-ChildItem 'C:yourfile*.xml' -Recurse | ForEach {
 (Get-Content $_ | ForEach { $_ -replace '[MYID]', 'MyValue' }) |
 Set-Content $_
}
</code></pre>

blocks|key|296812|text|您可以尝试如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296813|$path+=+"C:\testFile.txt"
$word+=+"searchword"
$replacement+=+"ReplacementText"
$text+=+get-content+$path+
$newText+=+$text+-replace+$word,$replacement
$newText+>+$path|code-block|syntax|javascript|296814|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could try something like this: 

<pre><code>$path = "C:\testFile.txt"
$word = "searchword"
$replacement = "ReplacementText"
$text = get-content $path 
$newText = $text -replace $word,$replacement
$newText &gt; $path
</code></pre>

blocks|key|79589|text|这就是我使用的，但它在大型文本文件上速度很慢。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|79590|get-content+$pathToFile+%7C+%25+{+$_+-replace+$stringToReplace,+$replaceWith+}+%7C+set-content+$pathToFile|code-block|syntax|javascript|79591|如果您要替换大型文本文件中的字符串，并且速度是个问题，请考虑使用System.IO.StreamReader和System.IO.StreamWriter。|offset|length|79592|try
{
+++$reader+=+[System.IO.StreamReader]+$pathToFile
+++$data+=+$reader.ReadToEnd()
+++$reader.close()
}
finally
{
+++if+($reader+-ne+$null)
+++{
+++++++$reader.dispose()
+++}
}

$data+=+$data+-replace+$stringToReplace,+$replaceWith

try
{
+++$writer+=+[System.IO.StreamWriter]+$pathToFile
+++$writer.write($data)
+++$writer.close()
}
finally
{
+++if+($writer+-ne+$null)
+++{
+++++++$writer.dispose()
+++}
}|79593|(上面的代码尚未经过测试。)|79594|使用StreamReader和StreamWriter替换文档中的文本可能有一种更优雅的方法，但这应该是一个很好的起点。|79595|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/en-us/library/system.io.streamreader%2528v=vs.110%2529.aspx|1|https://msdn.microsoft.com/en-us/library/system.io.streamwriter%2528v=vs.110%2529.aspx^0|0|0|W|M|0|1J|M|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@$I|13|J|14|1|15]|$I|16|J|17|1|18]]|A|$]]|$1|K|3|L|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|1A|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1B|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

This is what I use, but it is slow on large text files.

<pre><code>get-content $pathToFile | % { $_ -replace $stringToReplace, $replaceWith } | set-content $pathToFile
</code></pre>

If you are going to be replacing strings in large text files and speed is a concern, look into using <a href="https://msdn.microsoft.com/en-us/library/system.io.streamreader%28v=vs.110%29.aspx" rel="noreferrer">System.IO.StreamReader</a> and <a href="https://msdn.microsoft.com/en-us/library/system.io.streamwriter%28v=vs.110%29.aspx" rel="noreferrer">System.IO.StreamWriter</a>.

<pre><code>try
{
 $reader = [System.IO.StreamReader] $pathToFile
 $data = $reader.ReadToEnd()
 $reader.close()
}
finally
{
 if ($reader -ne $null)
 {
 $reader.dispose()
 }
}

$data = $data -replace $stringToReplace, $replaceWith

try
{
 $writer = [System.IO.StreamWriter] $pathToFile
 $writer.write($data)
 $writer.close()
}
finally
{
 if ($writer -ne $null)
 {
 $writer.dispose()
 }
}
</code></pre>

(The code above has not been tested.)

There is probably a more elegant way to use StreamReader and StreamWriter for replacing text in a document, but that should give you a good starting point.

blocks|key|297073|text|由于这种情况经常出现，我为它定义了一个函数。我默认使用区分大小写的、基于正则表达式的匹配，但我包含了一些开关，用于定位文字文本和忽略大小写。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|297074|#+Find+and+replace+text+in+each+pipeline+string.++Omit+the+-Replace+parameter+to+delete
#+text+instead.++Use+the+-SimpleMatch+switch+to+work+with+literal+text+instead+of+regular
#+expressions.++Comparisons+are+case-sensitive+unless+the+-IgnoreCase+switch+is+used.
Filter+Edit-String+{
++++Param([string]$Find,+[string]$Replace='',+[switch]$SimpleMatch,+[switch]$IgnoreCase)+

++++if+($SimpleMatch)+{
++++++++if+($IgnoreCase)+{
++++++++++++return+$_.Replace($Find,+$Replace,
++++++++++++++++[System.StringComparison]::OrdinalIgnoreCase)
++++++++}
++++++++return+$_.Replace($Find,+$Replace)
++++}
++++if+($IgnoreCase)+{
++++++++return+$_+-replace+$Find,+$Replace
++++}
++++return+$_+-creplace+$Find,+$Replace
}

Set-Alias+replace+Edit-String
Set-Alias+sc+Set-Content++|code-block|syntax|javascript|297075|用法|297076|#+1+file
$f+=+a.txt;+gc+$f+%7C+replace+'[MYID]'+'MyValue'+-SimpleMatch+%7C+sc+$f

#+0+to+many+files
gci+*.txt+%7C+%25+{+gc+$_+%7C+replace+'\[MYID\]'+'MyValue'+%7C+sc+$_+}

#+Several+replacements+chained+together
...+%7C+replace+'[1-9]'+T+%7C+replace+a+b+-IgnoreCase+%7C+replace+'delete+me'+%7C+...

#+Alias+cheat+sheet
#++gci+Get-ChildItem
#++gc++Get-Content
#++sc++Set-Conent
#++%25+++ForEach-Object|297077|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Since this comes up often, I defined a function for it. I defaulted to case-sensitive, regex-based matching, but I included switches for targeting literal text and ignoring case.
<pre><code># Find and replace text in each pipeline string. Omit the -Replace parameter to delete
# text instead. Use the -SimpleMatch switch to work with literal text instead of regular
# expressions. Comparisons are case-sensitive unless the -IgnoreCase switch is used.
Filter Edit-String {
 Param([string]$Find, [string]$Replace='', [switch]$SimpleMatch, [switch]$IgnoreCase) 

 if ($SimpleMatch) {
 if ($IgnoreCase) {
 return $_.Replace($Find, $Replace,
 [System.StringComparison]::OrdinalIgnoreCase)
 }
 return $_.Replace($Find, $Replace)
 }
 if ($IgnoreCase) {
 return $_ -replace $Find, $Replace
 }
 return $_ -creplace $Find, $Replace
}

Set-Alias replace Edit-String
Set-Alias sc Set-Content 
</code></pre>
Usage
<pre><code># 1 file
$f = a.txt; gc $f | replace '[MYID]' 'MyValue' -SimpleMatch | sc $f

# 0 to many files
gci *.txt | % { gc $_ | replace '\[MYID\]' 'MyValue' | sc $_ }

# Several replacements chained together
... | replace '[1-9]' T | replace a b -IgnoreCase | replace 'delete me' | ...

# Alias cheat sheet
# gci Get-ChildItem
# gc Get-Content
# sc Set-Conent
# % ForEach-Object
</code></pre>

blocks|key|79702|text|使用PowerShell中的当前工作目录，这对我很有效。您需要使用FullName属性，否则它在PowerShell版本5中将不起作用。我需要在所有CSPROJ文件中更改目标.NET框架版本。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|79703|gci+-Recurse+-Filter+*.csproj+%7C
%25+{+(get-content+"$($_.FullName)")
.Replace('<TargetFramework>net47</TargetFramework>',+'<TargetFramework>net462</TargetFramework>')+%7C
+Set-Content+"$($_.FullName)"}|code-block|syntax|javascript|79704|entityMap^0|X|8|22|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

This worked for me using the current working directory in PowerShell. You need to use the <code>FullName</code> property, or it won't work in PowerShell version 5. I needed to change the target .NET framework version in ALL my <code>CSPROJ</code> files.

<pre class="lang-bsh prettyprint-override"><code>gci -Recurse -Filter *.csproj |
% { (get-content "$($_.FullName)")
.Replace('&lt;TargetFramework&gt;net47&lt;/TargetFramework&gt;', '&lt;TargetFramework&gt;net462&lt;/TargetFramework&gt;') |
 Set-Content "$($_.FullName)"}
</code></pre>

blocks|key|297020|text|这是一个相当简单的方法，它支持多行正则表达式、多个文件(使用管道)、指定输出编码等。由于ReadAllText方法，不推荐用于非常大的文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|297021|#+Update-FileText.ps1

#requires+-version+2

<#
.SYNOPSIS
Updates+text+in+files+using+a+regular+expression.

.DESCRIPTION
Updates+text+in+files+using+a+regular+expression.

.PARAMETER+Pattern
Specifies+the+regular+expression+pattern.

.PARAMETER+Replacement
Specifies+the+regular+expression+replacement+pattern.

.PARAMETER+Path
Specifies+the+path+to+one+or+more+files.+Wildcards+are+not+supported.+Each+file+is+read+entirely+into+memory+to+support+multi-line+searching+and+replacing,+so+performance+may+be+slow+for+large+files.

.PARAMETER+CaseSensitive
Specifies+case-sensitive+matching.+The+default+is+to+ignore+case.

.PARAMETER+SimpleMatch
Specifies+a+simple+match+rather+than+a+regular+expression+match+(i.e.,+the+Pattern+parameter+specifies+a+simple+string+rather+than+a+regular+expression).

.PARAMETER+Multiline
Changes+the+meaning+of+%5E+and+$+so+they+match+at+the+beginning+and+end,+respectively,+of+any+line,+and+not+just+the+beginning+and+end+of+the+entire+file.+The+default+is+that+%5E+and+$,+respectively,+match+the+beginning+and+end+of+the+entire+file.

.PARAMETER+UnixText
Causes+$+to+match+only+linefeed+(\n)+characters.+By+default,+$+matches+carriage+return%2Blinefeed+(\r\n).+(Windows-based+text+files+usually+use+\r\n+as+line+terminators,+while+Unix-based+text+files+usually+use+only+\n.)

.PARAMETER+Overwrite
Overwrites+a+file+by+creating+a+temporary+file+containing+all+replacements+and+then+replacing+the+original+file+with+the+temporary+file.+The+default+is+to+output+but+not+overwrite.

.PARAMETER+Force
Allows+overwriting+of+read-only+files.+Note+that+this+parameter+cannot+override+security+restrictions.

.PARAMETER+Encoding
Specifies+the+encoding+for+the+file+when+-Overwrite+is+used.+Possible+values+for+this+parameter+are+ASCII,+BigEndianUnicode,+Unicode,+UTF32,+UTF7,+and+UTF8.+The+default+value+is+ASCII.

.INPUTS
System.IO.FileInfo.

.OUTPUTS
System.String+(single-line+file)+or+System.String[]+(file+with+more+than+one+line)+without+the+-Overwrite+parameter,+or+nothing+with+the+-Overwrite+parameter.

.LINK
about_Regular_Expressions

.EXAMPLE
C:\>+Update-FileText.ps1+'(Ferb)+and+(Phineas)'+'$2+and+$1'+Story.txt

This+command+replaces+the+text+'Ferb+and+Phineas'+with+the+text+'Phineas+and+Ferb'+in+the+file+Story.txt+and+outputs+the+content.+Note+that+the+pattern+and+replacement+strings+are+enclosed+in+single+quotes+to+prevent+variable+expansion.

.EXAMPLE
C:\>+Update-FileText.ps1+'Perry'+'Agent+P'+Story2.txt+-Overwrite

This+command+replaces+the+text+'Perry'+with+the+text+'Agent+P'+in+the+file+Story2.txt.
#>

[CmdletBinding(SupportsShouldProcess+=+$true,ConfirmImpact+=+"High")]
param(
++[Parameter(Mandatory+=+$true,Position+=+0,ValueFromPipeline+=+$true)]
++[String[]]+$Path,

++[Parameter(Mandatory+=+$true,Position+=+1)]
++[String]+$Pattern,

++[Parameter(Mandatory+=+$true,Position+=+2)]
++[AllowEmptyString()]
++[String]+$Replacement,

++[Switch]+$CaseSensitive,

++[Switch]+$SimpleMatch,

++[Switch]+$Multiline,

++[Switch]+$UnixText,

++[Switch]+$Overwrite,

++[Switch]+$Force,

++[ValidateSet("ASCII","BigEndianUnicode","Unicode","UTF32","UTF7","UTF8")]
++[String]+$Encoding+=+"ASCII"
)

begin+{
++function+Get-TempName+{
++++param(
++++++$path
++++)
++++do+{
++++++$tempName+=+Join-Path+$path+([IO.Path]::GetRandomFilename())
++++}
++++while+(+Test-Path+$tempName+)
++++$tempName
++}

++if+(+$SimpleMatch+)+{
++++++$Pattern+=+[Regex]::Escape($Pattern)
++}
++else+{
++++if+(+-not+$UnixText+)+{
++++++$Pattern+=+$Pattern+-replace+'(?<!\\)\$','\r$'
++++}
++}

++function+New-Regex+{
++++$regexOpts+=+[Text.RegularExpressions.RegexOptions]::None
++++if+(+-not+$CaseSensitive+)+{
++++++$regexOpts+=+$regexOpts+-bor+[Text.RegularExpressions.RegexOptions]::IgnoreCase
++++}
++++if+(+$Multiline+)+{
++++++$regexOpts+=+$regexOpts+-bor+[Text.RegularExpressions.RegexOptions]::Multiline
++++}
++++New-Object+Text.RegularExpressions.Regex+$Pattern,$regexOpts
++}

++$Regex+=+New-Regex

++function+Update-FileText+{
++++param(
++++++$path
++++)
++++$pathInfo+=+Resolve-Path+-LiteralPath+$path
++++if+(+$pathInfo+)+{
++++++if+(+(Get-Item+$pathInfo).GetType().FullName+-eq+"System.IO.FileInfo"+)+{
++++++++$fullName+=+$pathInfo.Path
++++++++Write-Verbose+"Reading+'$fullName'"
++++++++$text+=+[IO.File]::ReadAllText($fullName)
++++++++Write-Verbose+"Finished+reading+'$fullName'"
++++++++if+(+-not+$Overwrite+)+{
++++++++++$regex.Replace($text,$Replacement)
++++++++}
++++++++else+{
++++++++++$tempName+=+Get-TempName+(Split-Path+$fullName+-Parent)
++++++++++Set-Content+$tempName+$null+-Confirm:$false
++++++++++if+(+$?+)+{
++++++++++++Write-Verbose+"Created+file+'$tempName'"
++++++++++++try+{
++++++++++++++Write-Verbose+"Started+writing+'$tempName'"
++++++++++++++[IO.File]::WriteAllText("$tempName",$Regex.Replace($text,$Replacement),[Text.Encoding]::$Encoding)
++++++++++++++Write-Verbose+"Finished+writing+'$tempName'"
++++++++++++++Write-Verbose+"Started+copying+'$tempName'+to+'$fullName'"
++++++++++++++Copy-Item+$tempName+$fullName+-Force:$Force+-ErrorAction+Continue
++++++++++++++if+(+$?+)+{
++++++++++++++++Write-Verbose+"Finished+copying+'$tempName'+to+'$fullName'"
++++++++++++++}
++++++++++++++Remove-Item+$tempName
++++++++++++++if+(+$?+)+{
++++++++++++++++Write-Verbose+"Removed+file+'$tempName'"
++++++++++++++}
++++++++++++}
++++++++++++catch+[Management.Automation.MethodInvocationException]+{
++++++++++++++Write-Error+$Error[0]
++++++++++++}
++++++++++}
++++++++}
++++++}
++++++else+{
++++++++Write-Error+"The+item+'$path'+must+be+a+file+in+the+file+system."+-Category+InvalidType
++++++}
++++}
++}
}

process+{
++foreach+(+$PathItem+in+$Path+)+{
++++if+(+$Overwrite+)+{
++++++if+(+$PSCmdlet.ShouldProcess("'$PathItem'","Overwrite+file")+)+{
++++++++Update-FileText+$PathItem
++++++}
++++}
++++else+{
++++++Update-FileText+$PathItem
++++}
++}
}|code-block|syntax|javascript|297022|也可以作为gist+on+Github使用。|297023|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/Bill-Stewart/6b8e54e17526a0e6f7fafe432ca8a397^0|18|B|0|0|5|E|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Here's a fairly simple one that supports multiline regular expressions, multiple files (using the pipeline), specifying output encoding, etc. Not recommended for very large files due to the <code>ReadAllText</code> method.
<pre><code># Update-FileText.ps1

#requires -version 2

&lt;#
.SYNOPSIS
Updates text in files using a regular expression.

.DESCRIPTION
Updates text in files using a regular expression.

.PARAMETER Pattern
Specifies the regular expression pattern.

.PARAMETER Replacement
Specifies the regular expression replacement pattern.

.PARAMETER Path
Specifies the path to one or more files. Wildcards are not supported. Each file is read entirely into memory to support multi-line searching and replacing, so performance may be slow for large files.

.PARAMETER CaseSensitive
Specifies case-sensitive matching. The default is to ignore case.

.PARAMETER SimpleMatch
Specifies a simple match rather than a regular expression match (i.e., the Pattern parameter specifies a simple string rather than a regular expression).

.PARAMETER Multiline
Changes the meaning of ^ and $ so they match at the beginning and end, respectively, of any line, and not just the beginning and end of the entire file. The default is that ^ and $, respectively, match the beginning and end of the entire file.

.PARAMETER UnixText
Causes $ to match only linefeed (\n) characters. By default, $ matches carriage return+linefeed (\r\n). (Windows-based text files usually use \r\n as line terminators, while Unix-based text files usually use only \n.)

.PARAMETER Overwrite
Overwrites a file by creating a temporary file containing all replacements and then replacing the original file with the temporary file. The default is to output but not overwrite.

.PARAMETER Force
Allows overwriting of read-only files. Note that this parameter cannot override security restrictions.

.PARAMETER Encoding
Specifies the encoding for the file when -Overwrite is used. Possible values for this parameter are ASCII, BigEndianUnicode, Unicode, UTF32, UTF7, and UTF8. The default value is ASCII.

.INPUTS
System.IO.FileInfo.

.OUTPUTS
System.String (single-line file) or System.String[] (file with more than one line) without the -Overwrite parameter, or nothing with the -Overwrite parameter.

.LINK
about_Regular_Expressions

.EXAMPLE
C:\&gt; Update-FileText.ps1 '(Ferb) and (Phineas)' '$2 and $1' Story.txt

This command replaces the text 'Ferb and Phineas' with the text 'Phineas and Ferb' in the file Story.txt and outputs the content. Note that the pattern and replacement strings are enclosed in single quotes to prevent variable expansion.

.EXAMPLE
C:\&gt; Update-FileText.ps1 'Perry' 'Agent P' Story2.txt -Overwrite

This command replaces the text 'Perry' with the text 'Agent P' in the file Story2.txt.
#&gt;

[CmdletBinding(SupportsShouldProcess = $true,ConfirmImpact = &quot;High&quot;)]
param(
 [Parameter(Mandatory = $true,Position = 0,ValueFromPipeline = $true)]
 [String[]] $Path,

 [Parameter(Mandatory = $true,Position = 1)]
 [String] $Pattern,

 [Parameter(Mandatory = $true,Position = 2)]
 [AllowEmptyString()]
 [String] $Replacement,

 [Switch] $CaseSensitive,

 [Switch] $SimpleMatch,

 [Switch] $Multiline,

 [Switch] $UnixText,

 [Switch] $Overwrite,

 [Switch] $Force,

 [ValidateSet(&quot;ASCII&quot;,&quot;BigEndianUnicode&quot;,&quot;Unicode&quot;,&quot;UTF32&quot;,&quot;UTF7&quot;,&quot;UTF8&quot;)]
 [String] $Encoding = &quot;ASCII&quot;
)

begin {
 function Get-TempName {
 param(
 $path
 )
 do {
 $tempName = Join-Path $path ([IO.Path]::GetRandomFilename())
 }
 while ( Test-Path $tempName )
 $tempName
 }

 if ( $SimpleMatch ) {
 $Pattern = [Regex]::Escape($Pattern)
 }
 else {
 if ( -not $UnixText ) {
 $Pattern = $Pattern -replace '(?&lt;!\\)\$','\r$'
 }
 }

 function New-Regex {
 $regexOpts = [Text.RegularExpressions.RegexOptions]::None
 if ( -not $CaseSensitive ) {
 $regexOpts = $regexOpts -bor [Text.RegularExpressions.RegexOptions]::IgnoreCase
 }
 if ( $Multiline ) {
 $regexOpts = $regexOpts -bor [Text.RegularExpressions.RegexOptions]::Multiline
 }
 New-Object Text.RegularExpressions.Regex $Pattern,$regexOpts
 }

 $Regex = New-Regex

 function Update-FileText {
 param(
 $path
 )
 $pathInfo = Resolve-Path -LiteralPath $path
 if ( $pathInfo ) {
 if ( (Get-Item $pathInfo).GetType().FullName -eq &quot;System.IO.FileInfo&quot; ) {
 $fullName = $pathInfo.Path
 Write-Verbose &quot;Reading '$fullName'&quot;
 $text = [IO.File]::ReadAllText($fullName)
 Write-Verbose &quot;Finished reading '$fullName'&quot;
 if ( -not $Overwrite ) {
 $regex.Replace($text,$Replacement)
 }
 else {
 $tempName = Get-TempName (Split-Path $fullName -Parent)
 Set-Content $tempName $null -Confirm:$false
 if ( $? ) {
 Write-Verbose &quot;Created file '$tempName'&quot;
 try {
 Write-Verbose &quot;Started writing '$tempName'&quot;
 [IO.File]::WriteAllText(&quot;$tempName&quot;,$Regex.Replace($text,$Replacement),[Text.Encoding]::$Encoding)
 Write-Verbose &quot;Finished writing '$tempName'&quot;
 Write-Verbose &quot;Started copying '$tempName' to '$fullName'&quot;
 Copy-Item $tempName $fullName -Force:$Force -ErrorAction Continue
 if ( $? ) {
 Write-Verbose &quot;Finished copying '$tempName' to '$fullName'&quot;
 }
 Remove-Item $tempName
 if ( $? ) {
 Write-Verbose &quot;Removed file '$tempName'&quot;
 }
 }
 catch [Management.Automation.MethodInvocationException] {
 Write-Error $Error[0]
 }
 }
 }
 }
 else {
 Write-Error &quot;The item '$path' must be a file in the file system.&quot; -Category InvalidType
 }
 }
 }
}

process {
 foreach ( $PathItem in $Path ) {
 if ( $Overwrite ) {
 if ( $PSCmdlet.ShouldProcess(&quot;'$PathItem'&quot;,&quot;Overwrite file&quot;) ) {
 Update-FileText $PathItem
 }
 }
 else {
 Update-FileText $PathItem
 }
 }
}
</code></pre>
Also available as a <a href="https://gist.github.com/Bill-Stewart/6b8e54e17526a0e6f7fafe432ca8a397" rel="nofollow noreferrer">gist on Github</a>.

blocks|key|79659|text|对Set-Content命令的小更正。如果没有找到搜索到的字符串，Set-Content命令将清空(清空)目标文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|79660|您可以首先验证您要查找的字符串是否存在。如果没有，它将不会取代任何东西。|79661|If+(select-string+-path+"c:\Windows\System32\drivers\etc\hosts"+-pattern+"String+to+look+for")+`
++++{(Get-Content+c:\Windows\System32\drivers\etc\hosts).replace('String+to+look+for',+'String+to+replace+with')+%7C+Set-Content+c:\Windows\System32\drivers\etc\hosts}
++++Else{"Nothing+happened"}|code-block|syntax|javascript|79662|entityMap^0|X|B|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Small correction for the Set-Content command. If the searched string is not found the <code>Set-Content</code> command will blank (empty) the target file.

You can first verify if the string you are looking for exist or not. If not it will not replace anything.

<pre><code>If (select-string -path "c:\Windows\System32\drivers\etc\hosts" -pattern "String to look for") `
 {(Get-Content c:\Windows\System32\drivers\etc\hosts).replace('String to look for', 'String to replace with') | Set-Content c:\Windows\System32\drivers\etc\hosts}
 Else{"Nothing happened"}
</code></pre>

Using PowerShell, I want to replace all exact occurrences of <code>[MYID]</code> in a given file with <code>MyValue</code>. What is the easiest way to do so?

How can I replace every occurrence of a String in a file with PowerShell?

Windows

Unix

使用PowerShell，我想用MyValue替换给定文件中所有确切出现的[MYID]。最简单的方法是什么？

问如何用PowerShell替换文件中出现的所有字符串？
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回答 8

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