Powershell:从文件末尾向后搜索

# 定义要搜索的文件和关键字
$filePath = "C:\example.txt"
$searchTerm = "example"

# 获取文件长度
$fileLength = (Get-Content $filePath).Length

# 计算从文件末尾开始搜索的偏移量
$searchOffset = $fileLength - 1

# 从文件末尾开始搜索
$foundIndex = $searchOffset
while ($foundIndex -lt $fileLength) {
    if ( (Get-Content $filePath).Substring( $searchOffset, 1 ) -eq $searchTerm ) {
        Write-Output "Found search term at index $($foundIndex)"
        break
    }
    $foundIndex = $foundIndex - 1
}

# 如果没有找到搜索项，则输出一条消息
if ($foundIndex -lt $fileLength) {
    Write-Output "Search term not found in file"
}