PowerShell脚本优化：多路径检查后仅发送一次邮件需求

现有PowerShell脚本用于检查多个文件夹是否存在新文件，若存在则发送包含日志的邮件。当前脚本在检测到某路径有新文件时会立即发送邮件，而非完成所有路径检查后统一发送一次。需修改脚本实现：完成所有路径检查后，若存在新文件则仅发送一次邮件。

原脚本代码 #

$source = Get-Content "C:\AAA\source.txt"
$logDate = get-date -format yyyy-MM-dd
$logtime = get-date -format HH:mm
$log = "C:\AAA\$logdate.log"

$mailkomu = "EEE@EEE.com"
$mailod = "GGG@GGG.com"
$subject = "New files in DDD"
$zprava = "Message"

ForEach($path in $source){
    Test-path $path
    Write-Output "$logtime - $path - ok" | Out-File $log -Append 
    If ((Get-ChildItem -Path $path -Force | Measure-Object).Count -eq 0) {
        Write-Output "no files" | Out-File $log -Append
    }
    Else { 
        Write-Output "new files" | Out-File $log -Append
        $data = Get-ChildItem -Path $path -Recurse | Select-Object DirectoryName, Name
        $data | Out-File $log -Append
        Send-MailMessage -From $mailod -To $mailkomu -Subject $subject -Body $zprava -SmtpServer $SMTPServer -Attachments $log
        }
}

原脚本问题场景 #

first path - no file - sends no email
second path - new file - sends email with log only for the first and the second path
third path - new file - sends email with log only for the first, second and the third path
fourth path - no file - sends no email

$source = Get-Content "C:\AAA\source.txt"
$logDate = Get-Date -Format yyyy-MM-dd
$logTime = Get-Date -Format HH:mm
$log = "C:\AAA\$logDate.log"

$mailTo = "EEE@EEE.com"
$mailFrom = "GGG@GGG.com"
$subject = "New files in DDD"
$body = "Message"
# 全局标记：是否检测到新文件
$hasNewFiles = $false

# 遍历所有路径完成检查与日志记录
foreach ($path in $source) {
    if (Test-Path $path) {
        Write-Output "$logTime - $path - 路径正常" | Out-File $log -Append
        $fileCount = (Get-ChildItem -Path $path -Force | Measure-Object).Count
        
        if ($fileCount -eq 0) {
            Write-Output "  → 无文件" | Out-File $log -Append
        }
        else {
            Write-Output "  → 检测到 $fileCount 个新文件" | Out-File $log -Append
            $fileList = Get-ChildItem -Path $path -Recurse | Select-Object DirectoryName, Name
            $fileList | Out-File $log -Append
            # 标记存在新文件
            $hasNewFiles = $true
        }
    }
    else {
        Write-Output "$logTime - $path - 路径不存在" | Out-File $log -Append
    }
}

# 所有检查完成后，仅当存在新文件时发送一次邮件
if ($hasNewFiles) {
    Send-MailMessage -From $mailFrom -To $mailTo -Subject $subject -Body $body -SmtpServer $SMTPServer -Attachments $log
}

修改要点 #

• 新增$hasNewFiles布尔变量，用于统一记录是否在任意路径检测到新文件
• 将邮件发送逻辑移出循环，放到所有路径检查完成后的判断分支中，确保仅发送一次邮件
• 优化日志内容的可读性，补充路径不存在的异常情况处理
• 修正原脚本中Test-Path未判断返回值的问题，避免错误日志输出

内容的提问来源于stack exchange，提问作者Tomas