PowerShell实现简单的grep功能

param($str, $path="./") #输入参数，默认在当前目录及其子目录下查找if([String]::IsNullOrEmpty($str)){  Write-Output "Caution: input string is empty"  exit}$path = Resolve-Path $path #获取绝对路径if([System.IO.Directory]::Exists($path)){  $subPathList = Get-ChildItem $path -Recurse *.* #获取所有子目录  foreach($subPath in $subPathList){    $subPath = $subPath.FullName    if([System.IO.Directory]::Exists($subPath)){      Continue    }    $foundArr = Select-String -path $subPath -Pattern $str    foreach($found in $foundArr)    {      if($found -match "(.+:/d+):") #删除行号后面的内容      {        Write-Output $matches[1]      }    }  }}elseif([system.IO.File]::Exists($path)){  $foundArr = Select-String -path $path -Pattern $str  foreach($found in $foundArr)  {    if($found -match "(.+:/d+):")    {      Write-Output $matches[1]    }  }}