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A cmdlet (pronounced "command-let") is a lightweight Windows PowerShell script that performs a single function. A cmdlet, which is expressed as a verb-noun pair, has a .ps1 extension.
Although Windows PowerShell includes more than two hundred basic core cmdlets, administrators can also write their own cmdlets and share them. Each cmdlet will have a help file that can be accessed by typing Get-Help CmdletName-Detailed. The detailed view of the cmdlet help file includes a description of the cmdlet, the command syntax, descriptions of the parameters and an example that demonstrate use of the cmdlet.
Popular basic cmdlets include:
| Cmdlet | Function | 
| Get-Location | get the current directory | 
| Set-Location | change the current directory | 
| Copy-Item | copy files | 
| Remove-Item | remove a file or directory | 
| Move-Item | move a file | 
| Rename-Item | rename a file | 
| New-Item create a new empty file or directory | create a new empty file or directory | 
参考:
http://whatis.techtarget.com/definition/cmdlet
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原文地址:http://www.cnblogs.com/lizhaoxian/p/5100223.html