Question

我正在尝试创建一个执行以下操作的脚本：

打印文件
删除所有空行
过滤掉所有不包含“重新分配”字样的行
从每行的开头删除所有空格和“＆gt;”

一切正常，直到我添加第4步的函数，之后powershell吐出一堆错误。我在这里做错了什么？

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

所有的功能都是单独运行的，当我尝试添加最后一部分时，事情就搞砸了。

Answer 1

我的通灵能力告诉我，您正试图在TrimStart cmdlet返回的MatchInfo对象上使用String的{{3}}方法。

首先尝试将其强制转换为字符串：

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

Answer 2

此正则表达式模式：^Reassignment$仅匹配具有完全值Reassignment的行 - 并非所有包含 Reassignment的行

当您已经使用Get-Content（cat）来读取文件中的行时，您也可以在所有行上使用-match运算符（{{1}为了区分大小写）：

-cmatch

(cat .\csvtest.txt) -cmatch 'Reassignment'运算符只返回匹配的字符串，因此您可以直接调用-match：

TrimStart()

为什么这个powershell脚本不会执行

2 个答案: