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[powershell/zh-cn] Add poweshell Simplified Chinsese version
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---
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category: tool
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tool: powershell
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contributors:
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- ["Wouter Van Schandevijl", "https://github.com/laoujin"]
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translators:
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- ["Feng Gao", "https://github.com/gaufung"]
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filename: LearnPowershell.ps1
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---
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PowerShell 是 Windows 平台下的脚本语言同时也是配置管理框架,它是建立在微软 .Net Framework 之上,Windows 7 以及之后版本都内置 Poweshell。下面的示例中都是 PoweShell 脚本的一部分或者直接能够在 Shell 交互窗口中执行。
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与 Bash 最大的不同是你大部分操作的东西是对象而不是普通的文本。
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[延伸阅读](https://technet.microsoft.com/en-us/library/bb978526.aspx)
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如果你不确定你的环境,执行如下操作:
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```powershell
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Get-ExecutionPolicy -List
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Set-ExecutionPolicy AllSigned
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# Execution Policy 包含以下:
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# - Restricted: 不会运行脚本。
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# - RemoteSigned: 只会运行受信任的发行商下载的脚本。
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# - AllSigned: 运行需要被信任发行商签名的脚本。
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# - Unrestricted: 运行所有脚本
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help about_Execution_Policies # 查看更多信息
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# 当前 PowerShell 版本
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$PSVersionTable
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```
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获取帮助
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```powershell
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# 查找命令
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Get-Command about_* # 别名: gcm
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Get-Command -Verb Add
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Get-Alias ps
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Get-Alias -Definition Get-Process
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Get-Help ps | less # 别名: help
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ps | Get-Member # 别名: gm
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Show-Command Get-EventLog # GUI 填充参数
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Update-Help # 管理员运行
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```
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接下来是教程
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```powershell
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# 正如你看到的,每一行开头是 # 都是注释
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# 简单的 Hello World 实例
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echo Hello world!
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# echo 是 Write-Output (cmdlet) 的别名
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# 大部分 cmdlet 和函数都遵循 "动词-名词" 命名规则。
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# 每个命令都从新的一行开始或者是一个分号
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echo 'This is the first line'; echo 'This is the second line'
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# 声明一个变量如下:
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$aString="Some string"
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# 或者像这样:
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$aNumber = 5 -as [double]
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$aList = 1,2,3,4,5
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$anEmptyList = @()
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$aString = $aList -join '--' # 也包含 join 方法
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$aHashtable = @{name1='val1'; name2='val2'}
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# 使用变量:
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echo $aString
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echo "Interpolation: $aString"
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echo "$aString has length of $($aString.Length)"
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echo '$aString'
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echo @"
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This is a Here-String
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$aString
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"@
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# 注意 ' (单引号) 不是变量的一部分
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# 在这里字符串也可以是单引号
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# 内置变量:
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# 下面是一些有用的内置变量,比如:
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echo "Booleans: $TRUE and $FALSE"
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echo "Empty value: $NULL"
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echo "Last program's return value: $?"
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echo "Exit code of last run Windows-based program: $LastExitCode"
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echo "The last token in the last line received by the session: $$"
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echo "The first token: $^"
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echo "Script's PID: $PID"
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echo "Full path of current script directory: $PSScriptRoot"
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echo 'Full path of current script: ' + $MyInvocation.MyCommand.Path
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echo "FUll path of current directory: $Pwd"
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echo "Bound arguments in a function, script or code block: $PSBoundParameters"
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echo "Unbound arguments: $($Args -join ', ')."
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# 更多的内置类型: `help about_Automatic_Variables`
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# 内联其他文件 (点操作符)
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. .\otherScriptName.ps1
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### 控制流
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# 下面是条件判断结构
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if ($Age -is [string]) {
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echo 'But.. $Age cannot be a string!'
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} elseif ($Age -lt 12 -and $Age -gt 0) {
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echo 'Child (Less than 12. Greater than 0)'
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} else {
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echo 'Adult'
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}
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# Switch 语句比其他语言更强大
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$val = "20"
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switch($val) {
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{ $_ -eq 42 } { "The answer equals 42"; break }
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'20' { "Exactly 20"; break }
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{ $_ -like 's*' } { "Case insensitive"; break }
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{ $_ -clike 's*'} { "clike, ceq, cne for case sensitive"; break }
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{ $_ -notmatch '^.*$'} { "Regex matching. cnotmatch, cnotlike, ..."; break }
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{ 'x' -contains 'x'} { "FALSE! -contains is for lists!"; break }
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default { "Others" }
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}
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# 经典的 For 循环
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for($i = 1; $i -le 10; $i++) {
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"Loop number $i"
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}
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# 或者可以更简洁
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1..10 | % { "Loop number $_" }
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# PowerShell 还提供其他循环方式
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foreach ($var in 'val1','val2','val3') { echo $var }
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# while () {}
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# do {} while ()
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# do {} until ()
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# 异常处理
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try {} catch {} finally {}
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try {} catch [System.NullReferenceException] {
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echo $_.Exception | Format-List -Force
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}
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### Providers
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# 列出当前目录下的文件和子目录
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ls # 或者 `dir`
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cd ~ # 回到主目录
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Get-Alias ls # -> Get-ChildItem
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# 这些 cmdlet 有更加通用的名称,因为它不仅仅只操作当前目录,这一点和其他脚本语言不同。
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cd HKCU: # 跳转 HKEY_CURRENT_USER 注册表中的值
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# 获取当前会话中的提供者
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Get-PSProvider
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### 管道
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# Cmdlets 中的参数用来控制它们的行为:
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Get-ChildItem -Filter *.txt -Name # 获取所有 txt 文件名。
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# 需要输入足够多的参数来确保没有歧义。
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ls -fi *.txt -n # -f 是不可以的因为 -Force 同样存在。
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# 使用 `Get-Help Get-ChildItem -Full` 来查看全部参数。
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# 之前 cmdlet 获取的结果输出可以作为一下个输入。
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# `$_` 指代当前管道处理的对象。
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ls | Where-Object { $_.Name -match 'c' } | Export-CSV export.txt
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ls | ? { $_.Name -match 'c' } | ConvertTo-HTML | Out-File export.html
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# 如果对管道的对象感到疑惑,使用 `Get-Member` 来查看该对象的可使用的方法和属性。
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ls | Get-Member
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Get-Date | gm
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# ` 是行连续标识符,或者在每一行结尾添加一个 |
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Get-Process | Sort-Object ID -Descending | Select-Object -First 10 Name,ID,VM `
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| Stop-Process -WhatIf
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Get-EventLog Application -After (Get-Date).AddHours(-2) | Format-List
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# 使用 % 作为 ForEach-Object 的简称。
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(a,b,c) | ForEach-Object `
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-Begin { "Starting"; $counter = 0 } `
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-Process { "Processing $_"; $counter++ } `
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-End { "Finishing: $counter" }
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# Get-Process 返回包含三列的表
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# 第三列是使用 2 位精度数值表示 VM 属性
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# 计算出来的列也可以表示更多的信息:
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# `@{name='lbl';expression={$_}`
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ps | Format-Table ID,Name,@{n='VM(MB)';e={'{0:n2}' -f ($_.VM / 1MB)}} -autoSize
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### 函数
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# [string] 注记是可选的。
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function foo([string]$name) {
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echo "Hey $name, have a function"
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}
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# 调用你的函数
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foo "Say my name"
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# 函数可以包含命名参数、参数的注记和可解析的文档
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<#
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.SYNOPSIS
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Setup a new website
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.DESCRIPTION
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Creates everything your new website needs for much win
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.PARAMETER siteName
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The name for the new website
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.EXAMPLE
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New-Website -Name FancySite -Po 5000
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New-Website SiteWithDefaultPort
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New-Website siteName 2000 # ERROR! Port argument could not be validated
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('name1','name2') | New-Website -Verbose
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#>
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function New-Website() {
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[CmdletBinding()]
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param (
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[Parameter(ValueFromPipeline=$true, Mandatory=$true)]
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[Alias('name')]
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[string]$siteName,
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[ValidateSet(3000,5000,8000)]
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[int]$port = 3000
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)
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BEGIN { Write-Verbose 'Creating new website(s)' }
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PROCESS { echo "name: $siteName, port: $port" }
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END { Write-Verbose 'Website(s) created' }
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}
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### 都是 .NET
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# PS 中的字符串事实上就是 .NET 的 System.String 类型
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# 所有 .NET 方法和属性都可用
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'string'.ToUpper().Replace('G', 'ggg')
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# 或者更加 PowerShell 一点
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'string'.ToUpper() -replace 'G', 'ggg'
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# 不确定这样的话 .NET 方法如何调用
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'string' | gm
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# 调用静态 .NET 方法的语法:
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[System.Reflection.Assembly]::LoadWithPartialName('Microsoft.VisualBasic')
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# 注意 .NET 方法调用必须使用括号,然而 PS 函数调用不能使用括号;
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# 如果你调用 cmdlet/PS 函数使用了括号,就相当于传递了参数列表。
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$writer = New-Object System.IO.StreamWriter($path, $true)
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$writer.Write([Environment]::NewLine)
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$writer.Dispose()
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### IO
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# 从输入读入一个值
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$Name = Read-Host "What's your name?"
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echo "Hello, $Name!"
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[int]$Age = Read-Host "What's your age?"
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# Test-Path, Split-Path, Join-Path, Resolve-Path
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# Get-Content filename # 返回字符串数组 string[]
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# Set-Content, Add-Content, Clear-Content
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Get-Command ConvertTo-*,ConvertFrom-*
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### 有用的东西
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# 更新 PATH
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$env:PATH = [System.Environment]::GetEnvironmentVariable("Path", "Machine") +
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";" + [System.Environment]::GetEnvironmentVariable("Path", "User")
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# 找到 Python 的 PATH
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$env:PATH.Split(";") | Where-Object { $_ -like "*python*"}
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# 改变工作目录而不需要记住之前的路径
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Push-Location c:\temp # 改变工作目录至 c:\temp
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Pop-Location # 改变到之前的工作目录
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# 别名: pushd 和 popd
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# 在下载之后解除目录阻塞
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Get-ChildItem -Recurse | Unblock-File
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# Windows 资源管理器打开当前目录
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ii .
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# 按任意键退出
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$host.UI.RawUI.ReadKey()
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return
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# 创建快捷方式
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$WshShell = New-Object -comObject WScript.Shell
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$Shortcut = $WshShell.CreateShortcut($link)
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$Shortcut.TargetPath = $file
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$Shortcut.WorkingDirectory = Split-Path $file
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$Shortcut.Save()
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```
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配置你的 PowerShell
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```powershell
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# $Profile 是文件 `Microsoft.PowerShell_profile.ps1` 完整路径
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# 下面所有的代码都在 PS 会话开始的时候执行
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if (-not (Test-Path $Profile)) {
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New-Item -Type file -Path $Profile -Force
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notepad $Profile
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}
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# 更多信息: `help about_profiles`
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# 更多关于 Shell 有用的信息,确保查看下面的 PSReadLine 项目。
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```
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更多项目
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* [Channel9](https://channel9.msdn.com/Search?term=powershell%20pipeline#ch9Search&lang-en=en) PowerShell 教程
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* [PSGet](https://github.com/psget/psget) PowerShell NuGet 包
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* [PSReadLine](https://github.com/lzybkr/PSReadLine/) 仿 bash 按行读取( Window10 默认包含)
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* [Posh-Git](https://github.com/dahlbyk/posh-git/) Git 命令提示 (推荐!)
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* [PSake](https://github.com/psake/psake) 自动构建工作
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* [Pester](https://github.com/pester/Pester) BDD 测试框架
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* [Jump-Location](https://github.com/tkellogg/Jump-Location) Poweshell 中 `cd` 来跳转目录
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* [PowerShell Community Extensions](http://pscx.codeplex.com/) (废弃)
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尚未涉及
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* WMI: Windows 管理规范 (Get-CimInstance)
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* 多任务: Start-Job -scriptBlock {...},
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* 代码签名
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* 远程 (Enter-PSSession/Exit-PSSession; Invoke-Command)
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