标题: PowerShell中Write-Host与Write-Output有哪些区别

创建: 2019-07-02 13:53
更新:
链接: https://scz.617.cn/windows/201907021353.txt

Write-Host与Write-Output主要区别有两点:

a) 如果想输出重定向，使用Write-Output
b) 对于逗号分隔的待输出项，Write-Host输出到一行，Write-Output输出到多行

--------------------------------------------------------------------------
Function Test-Output-0
{
    Write-Host "Hello World" -ForegroundColor White -BackgroundColor Green
}

Function Test-Output-1
{
    Write-Output "Hello World"
}

Function Receive-Output
{
    Process
    {
    Write-Host $_ -ForegroundColor Yellow -BackgroundColor Black
    }
}

Test-Output-0 | Receive-Output

Test-Output-1 | Receive-Output

Test-Output-1
--------------------------------------------------------------------------

第一个输出绿底白字，输出转向没有生效

第二个输出黑底黄字，输出转向生效

第三个输出使用控制台缺省配色

--------------------------------------------------------------------------
Write-Host "One", "Two", "Three"

Write-Output "One", "Two", "Three"
--------------------------------------------------------------------------

第一个在一行内输出"One Two Three"

第二个在三行依次输出"One"、"Two"、"Three"

--------------------------------------------------------------------------
Write-Host "key=" + "value"

Write-Output "key=" + "value"

Write-Host( "key=" + "value" )

[Console]::WriteLine( "key=" + "value" )
--------------------------------------------------------------------------

第一个在一行内输出"key= + value"

第二个在三行依次输出"key="、"+"、"value"

第三个在一行内输出"key=value"。圆括号使得先处理字符串的+操作，然后做为一个
参数传递给Write-Host。

第四个在一行内输出"key=value"。