为了管理变量,powershell提供了五个专门管理变量的命令Clear-Variable,Get-Variable,New-Variable,Remove-Variable,Set-Variable。因为虚拟驱动器variable:的存在,clear,remove,set打头的命令可以被代替。但是Get-Variable,New-Variable。却非常有用new-variable可以在定义变量时,指定变量的一些其它属性,比如访问权限。同样Get...
在另一篇名为使用正则表达式的多种方式的文章中,我详细介绍了 Select-String、-match 和$matches 变量。$null 或空测试$null 或空数组可能比较棘手。 下面是一些常见的数组陷阱。这个语句乍一看似乎可行。PowerShell 复制 if ( $array -eq $null) { 'Array is $null' } ...
我仔細查看了在另一篇名為 《多種使用 regex方法》的文章中的 Select-String、-match 和$Matches 變數。$null或空白測試$null 或空陣列可能很棘手。 以下是陣列的常見陷阱。乍看之下,這句話看起來應該可行。PowerShell 複製 if ( $array -eq $null) { 'Array is $null' } ...
[String]$scriptName ) $cmdLine="""$scriptName""$args& set" &$Env:SystemRoot\system32\cmd.exe /c$cmdLine| select-string'^([^=]*)=(.*)$'|foreach-object{ $varName=$_.Matches[0].Groups[1].Value $varValue=$_.Matches[0].Groups[2].Value set-itemEnv:$varName$varValue } } 加载...
ERROR: Variable: found in expression: is not defined. ERROR:Cannot process argument transformation on parameter 'DriveLetter'. Cannot convert value "$DriveLetter" to type "System.Char". Error: "String must be exactly one character long." escape the single quote inside an insert statement Escapi...
switch [-Regex | -Wildcard | -Exact] [-CaseSensitive] -File filename { string | number | variable | { <value-scriptblock> } { <action-scriptblock> } default { <action-scriptblock> } # optional } 如果不使用参数,switch的行为与使用Exact参数的行为相同。 它针对值执行不区分大小写的匹配。
The$Eventsvariable is sent down the pipeline to theSelect-Stringcmdlet.Select-Stringuses theInputObjectparameter. The$_variable represents the current object andmessageis a property of the event. ThePatternparameter species the stringFailedand searches for matches in$_.message.Select-Stringdisplays the...
they're matching significantly different things. Fortunately, there's a way to see what the –match operator is thinking under the hood: each time a match is made, a special variable called $matches is populated with the results of the match—that is, whatever characters in the string the ...
This will also return a true condition because the-matchoperation seeks a matching regular expression anywhere in the string. Every time you use the-matchoperator and it returns a true condition, then PowerShell also creates the$Matchesvariable. In the example, if you enter the$Matchesvaria...
5.Set-Variable :设置变量的值,如果该变量还不存在,则创建该变量 6.Set-PSBreakpoint :在行、命令或者变量上设置断点 7.Set-Location :将当前工作位置设置为指定的位置 8.Set-Item :将项的值更改为命令中指定的值 9.Set-Service :启动、停止和挂起服务并更改服务的属性 ...