為什么不執行此Powershell腳本

Question

我正在嘗試制作執行以下操作的腳本：

1. 打印文件
2. 刪除任何空白行
3. 過濾掉所有不包含單詞“ Reassignment”的行
4. 從每行的開頭刪除所有空格和“>”

一切正常，直到我在第4步中添加了功能，之后Powershell吐出了很多錯誤。 我在這里做錯了什么？

PS C:\Users\pzsr7z.000\Desktop\incidentoutput> cat .\csvtest.txt | ? {$_.trim() -ne "" } | sls "^Reassignment$" -Context 1,2 | foreach{ $_.TrimStart(">"," ")}
Method invocation failed because [Microsoft.PowerShell.Commands.MatchInfo] does not contain a method named 'TrimStart'.
At line:1 char:90
+ ... 1,2 | foreach{ $_.TrimStart(">"," ")}
+                    ~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFound

Method invocation failed because [Microsoft.PowerShell.Commands.MatchInfo] does not contain a method named 'TrimStart'.
At line:1 char:90
+ ... 1,2 | foreach{ $_.TrimStart(">"," ")}
+                    ~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFound

Method invocation failed because [Microsoft.PowerShell.Commands.MatchInfo] does not contain a method named 'TrimStart'.
At line:1 char:90
+ ... 1,2 | foreach{ $_.TrimStart(">"," ")}
+                    ~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFound

Method invocation failed because [Microsoft.PowerShell.Commands.MatchInfo] does not contain a method named 'TrimStart'.
At line:1 char:90
+ ... 1,2 | foreach{ $_.TrimStart(">"," ")}
+                    ~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFound

所有功能都各自獨立工作，當我嘗試添加最后一部分時，事情就搞砸了。

Answer 1

我的靈性告訴我，您正在嘗試對Select-String cmdlet返回的MatchInfo對象使用String的TrimStart方法。

嘗試先將其轉換為字符串：

... | sls "^Reassignment$" -Context 1,2 | foreach{ $_.ToString().TrimStart(">"," ")

Answer 2

此正則表達式模式： ^Reassignment$將僅匹配具有確切值Reassignment -並非所有包含 Reassignment 。

當您已經使用Get-Content （ cat ）從文件中讀取-match ，也可以在所有行上使用-match運算符（ -cmatch區分大小寫）：

(cat .\csvtest.txt) -cmatch 'Reassignment'

-match運算符僅返回匹配的字符串，因此您可以直接在這些字符串上調用TrimStart() ：

$ReassignmentLines = (cat .\csvtest.txt) -cmatch 'Reassignment' |ForEach-Object {
    $_.TrimStart(">"," ")
}