PowerShell 睡眠 |通过示例快速浏览 PowerShell Sleep

PowerShell 睡眠简介

在某些情况下，需要脚本暂停或停止一段时间才能继续执行。此类要求可借助 PowerShell 中的 Start-Sleep cmdlet 来处理。它的别名是睡眠。此 cmdlet 用于停止执行指定的秒数。该 cmdlet 是最容易理解和执行的 cmdlet 之一，因为它只有两个参数。可以在多种场景中使用此 cmdlet。但是，我们应该谨慎使用它，并且应该知道需要在 sleep cmdlet 中指定的确切时间范围才能使我们的操作成功。

语法：

以下是 Start-Sleep cmdlet 的语法：

姓名：

Start-Sleep

语法：

Start-Sleep [-Seconds] <int>  [<CommonParameters>]

Start-Sleep -Milliseconds <int>  [<CommonParameters>]

别名：

睡觉

参数：

• -MilliSeconds：这表示脚本或模块应暂停的时间（以毫秒为单位）。缩写为m。它的类型是int。它的别名以 ms 为单位。该参数的默认值为none。它接受管道输入，但不接受通配符。
• -秒：这表示脚本或模块应暂停的时间（以秒为单位）。它缩写为 s。它的类型是int。其别名为none。该参数的默认值为none。它接受管道输入，但不接受通配符。

示例：

代码：

Start-Sleep -Seconds 100 or Start-Sleep -s 100

输出：

上述 cmdlet 将使会话挂起或暂停 100 秒。

代码：

Start-Sleep -MilliSeconds 10000 or Start-Sleep -ms 10000

输出：

上述 cmdlet 将使会话暂停或暂停 1000 秒。

PowerShell 睡眠示例

下面给出了提到的示例：

例子#1

代码：

[int]$starttime = (Get-Date).Second
Write-Host "Welcome to the demo of PowerShell sleep"
Write-Host "Stopping the clock for five seconds"
Start-Sleep -Seconds 5
Write-Host "Stopping the clock for 10 seconds using alias"
Start-Sleep -s 10
Write-Host "Example of sleep using milliseconds"
Start-Sleep -MilliSeconds 100
[int]$endtime = (Get-Date).Second
Write-Host "Total time elapsed in second is" $($endtime - $starttime)

输出：

例子#2

代码：

[int]$starttime = (Get-Date).Second
Write-Host "Welcome to the demo of PowerShell sleep in while loop"
$test=0
while($test -ne 10)
{
$test++
Write-Host $test
if($test %2 -eq 0)
{
Write-Host "Sleeping for two seconds"
Start-Sleep -Seconds 2
}
}
[int]$endtime = (Get-Date).Second
Write-Host "Total time elapsed in second with sleep is" $($endtime - $starttime)
Write-Host "performing the same opeartion without sleep"
[int]$starttime = (Get-Date).Second
$test=0
while($test -ne 10)
{
$test++
Write-Host $test
if($test %2 -eq 0)
{
Write-Host $test
}
}
[int]$endtime = (Get-Date).Second
Write-Host "Total time elapsed in second without sleep is" $($endtime - $starttime)

输出：

例子#3

代码：

[int]$starttime = (Get-Date).Second
$fatherage = Read-Host "Enter your fathers age"
Start-sleep -Seconds 5
$motherage = Read-Host "Enter your mothers age"
Start-Sleep -Seconds 5
$yourage = Read-Host "Enter your age"
Start-Sleep -Seconds 5
$sistersage = Read-Host "Enter your sisters age"
Start-Sleep -Seconds 5
$avg=([int]$fatherage + [int]$motherage + [int]$sistersage +[int]$yourage)/4
Write-Host "the average age of your family is" $avg
[int]$endtime = (Get-Date).Second
Write-Host "Total time elapsed in second without sleep is" $($endtime - $starttime)

输出：

例子#4

显示指示进度的状态栏。

代码：

[int]$starttime = (Get-Date).Second
Write-Host "Welcome to the demo of start-sleep"
Function Start-Sleep($seconds)
{
$dt = (Get-Date).AddSeconds($seconds)
while($dt -gt (Get-Date))
{
$secondsLeft = $dt.Subtract((Get-Date)).TotalSeconds
$per = ($seconds - $secondsLeft) / $seconds * 100
Write-Progress -Activity "in progress" -Status "in progress..." -SecondsRemaining $secondsLeft -PercentComplete $per
[System.Threading.Thread]::Sleep(500)
}
Write-Progress -Activity "in progress" -Status "in progress..." -SecondsRemaining 0 -Completed
}
Write-Host "going to sleep for 1 second"
Start-Sleep 1
Write-Host "going to sleep for 2 second"
Start-Sleep 2
Write-Host "going to sleep for 3 second"
Start-Sleep 3
Write-Host "going to sleep for 4 second"
Start-Sleep 4
Write-Host "going to sleep for 5 second"
Start-Sleep 5
Write-Host "going to sleep for 6 second"
Start-Sleep 6
Write-Host "going to sleep for 7 second"
Start-Sleep 7
Write-Host "going to sleep for 8 second"
Start-Sleep 8
Write-Host "going to sleep for 9 second"
Start-Sleep 9
Write-Host "going to sleep for 10 second"
Start-Sleep 10
[int]$endtime = (Get-Date).Second
Write-Host "Total time elapsed in second without sleep is" $($endtime - $starttime)

输出：

例子#5

等待用户输入参数。

代码：

[int]$starttime = (Get-Date).Second
Write-Host "Welcome to the demo of start-sleep"
Function Start-Sleep($seconds)
{
$dt = (Get-Date).AddSeconds($seconds)
while($dt -gt (Get-Date))
{
$secondsLeft = $dt.Subtract((Get-Date)).TotalSeconds
$per = ($seconds - $secondsLeft) / $seconds * 100
Write-Progress -Activity "in progress" -Status "in progress..." -SecondsRemaining $secondsLeft -PercentComplete $per
[System.Threading.Thread]::Sleep(500)
}
Write-Progress -Activity "in progress" -Status "in progress..." -SecondsRemaining 0 -Completed
}
$sname=Read-Host "Enter student name"
Start-Sleep 2
while($sname -eq $null -or $sname -eq "")
{
$sname=Read-Host "Enter student name"
Start-Sleep 2
}
$sage=Read-Host "Enter student age"
Start-Sleep 2
while($sage -eq $null -or $sage -eq "")
{
$sage=Read-Host "Enter student age"
Start-Sleep 2
}
$smarks1=Read-Host "Enter marks in history"
Start-Sleep 2
while($smarks1 -eq $null -or $smarks1 -eq "")
{
$smarks1=Read-Host "Enter marks in history"
Start-Sleep 2
}
$smarks2=Read-Host "Enter marks in bio"
Start-Sleep 2
while($smarks2 -eq $null -or $smarks2 -eq "")
{
$smarks2=Read-Host "Enter marks in bio"
Start-Sleep 2
}
$smarks3=Read-Host "Enter marks in phy"
Start-Sleep 2
while($smarks3 -eq $null -or $smarks3 -eq "")
{
$smarks3=Read-Host "Enter marks in phy"
Start-Sleep 2
}
Write-Host "Student details are as follows"
$avg=([int]$smarks1+[int]$smarks2+[int]$smarks3)/3
Write-Host "Student name is:" $sname "`t Students age is:" $sage "`t students avg is:"$avg

输出：

结论

因此，在这里我们详细了解了 start-sleep cmdlet。它从参数、数据类型到默认值进行了解释。它还举例说明了如何使用别名值调用 cmdlet 及其参数。它演示了 Start-sleep cmdlet 在许多场景中的使用，例如在 while 循环中等待值、询问用户输入（除非用户提供值）等。