Question

如何将以下bash语句翻译为PowerShell？

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该语句关闭docker日志，直到它找到文本＆＃34; Initialization Complete＆＃34;，然后允许脚本继续。

我已经做到这一点，但我不确定如何在找到文本后继续执行脚本。

( docker-compose -f docker-compose.yml logs -f & ) | grep -q "Initialization Complete"

Answer 1

通常，PowerShell的tail -f等效项为Get-Content -Wait。

但是，Bash子shell（(...)）与后台进程（&）的巧妙组合没有直接的PowerShell等效。

相反，您必须使用循环来监控PowerShell中的后台进程：

# Start the Docker command as a background job.
$jb = Start-Job { docker-compose -f docker-compose.yml logs -f }

# Loop until the data of interest is found.
while ($jb.HasMoreData) { 
  # Receive new data output by the background command, if any,
  # and break out of the loop once the string of interest is found.
  Receive-Job $jb -OutVariable output | 
    ForEach-Object { if ($_ -match "Initialization Complete") { break } }
  # With a stream that is kept open, $jb.HasMoreData keeps reporting $true.
  # To avoid a tight loop, we sleep a little whenever nothing was received.
  if ($null -eq $output) { Start-Sleep -Seconds 1 } 
}

# Clean up the background job, if it has completed.
if ($jb.Status -eq 'Complete') { Remove-Job $jb }

在powershell中等待命令输出中的文本

1 个答案: