1.文件夹长度返回1

$folder = Get-Item c:\Windows
$folder.Length

$Host.length

2.后台执行任务

$code = {Get-Content D:\1.txt }            #定义任务

$job = Start-Job -ScriptBlock $code        #执行任务

$alljobs = Wait-Job $job                   #等待任务完成

$result = Receive-Job $alljobs             #接受任务

Remove-Job -Job $alljobs                   #删除任务

Write-Host $result                         #输出任务结果

后台任务耗时时间长，尽量使用管道筛选自己想要的结果

3.按多列排序

get-service | sort-object -property @{Expression="Status";Descending=$true}, @{Expression="DisplayName";Descending=$false}

4.快速输出相同行

Measure-Command { 
  $text = "Hello" 
  for ($x=0; $x -lt 10000; $x++) 
  { 
    $text += "status $x" 
  } 
  $text  
}

Measure-Command{ 
  $obj = New-Object -TypeName System.Text.StringBuilder 
  $null = $obj.Append("Hello"); 
  for($x=0;$x -lt 10000;$x++) 
  { 
    $null = $obj.Append("status $x"); 
  } 
  $obj 
}

5.设置参数的默认值

使用 $PSDefaultParameterValues.Add('*:Path', 'c:\Windows') 定义当调用带参数path的函数时默认的路径是c:\windows

可以使用函数名代替*，表示只是在调用这个函数时默认参数生效

$PSDefaultParameterValues.Add('Get-WmiObject:ComputerName', 'server12')

删除自己定义的默认参数

$PSDefaultParameterValues.Clear()

6.监听windows按键事件

7.开启powershell远程

Powershell远程管理 
被远程机器上执行 
Enable-PSRemoting -Force 
本机执行 
Enable-PSRemoting -Force 
Set-Item -Path WSMan:\localhost\client\trustedhosts -Value * -Force

8.设置命令执行超时

function Invoke-TimeoutCommand

{

param(

[int]$timeout,

[ScriptBlock] $ScriptBlock

)

$job = Start-Job -ScriptBlock $ScriptBlock

$job | Wait-Job -Timeout $timeout

if($job.State -ne 'finish')

{

Write-Warning 'timeout'

$job|Stop-Job|Remove-Job

return $null

}

else{

return $job | Receive-Job

}

}

Invoke-TimeoutCommand -Timeout 10 -ScriptBlock {

ping pstips.net -n 500

}

9.设置excel cvs编码为utf8

$Path = 'c:\temp\somedata.csv'

(Get-Content -Path $Path) | Set-Content -Path $Path -Encoding UTF8

10.异常捕获

try
{
 1/0
}
catch [DivideByZeroException]
{
 Write-Host "Divide by zero exception"
}
catch [System.Net.WebException],[System.Exception]
{
 Write-Host "Other exception"
}
finally
{
 Write-Host "cleaning up ..."
}

# 1/0

#$Error[0] | fl * -Force

查看到异常类型，然后捕获 -->标记，没有的为复制异常

11.两个时间段内的时间

$startdate = Get-Date

$end = Get-Date "2014-09-12"

$difference = New-TimeSpan -Start $startdate -End $end

#计算还多少天

$difference.Days

$days = [System.Math]::Ceiling($difference.TotalDays)+1

$workdays = 1..$days | ForEach-Object{

$startdate

$startdate=$startdate.AddDays(1)

}| Where-Object{$_.DayOfWeek -gt 0 -and $_.DayOfWeek -lt 6} | Measure-Object |Select-Object -ExpandProperty Count

12.文件路径中出现[]，路径不识别

13.复制过去5条命令

Get-History -Count 5 | Select-Object -ExpandProperty CommandLine | clip.exe

14.获取之前执行的命令

function Get-MyGeniusInput

{

param

(

$Count,

$Minute = 10000

)

$cutoff = (Get-Date).AddMinutes(-$Minute)

$null = $PSBoundParameters.Remove('Minute')

$result = Get-History @PSBoundParameters |

Where-Object { $_.StartExecutionTime -gt $cutoff } |

Select-Object -ExpandProperty CommandLine

$count = $result.Count

$result | clip.exe

Write-Warning "Copied $count command lines to the clipboard!"

}

Get-MyGeniusInput -Minute 25

15.加载函数

. "$PSScriptRoot\library1.ps1"