PowerShell (PowerShell Core) vs Windows PowerShell

More: https://docs.microsoft.com/en-us/powershell/scripting/whats-new/differences-from-windows-powershell

cmdlet

• A cmdlet is a lightweight command that is used in the PowerShell environment
• Commands for PowerShell are known as cmdlets. Cmdlets are native PowerShell commands. In addition to cmdlets, PowerShell allows you to run any command available on your system
• Cmdlets are collected into PowerShell modules that can be loaded on demand
• Cmdlets can be written in any compiled .NET language or in the PowerShell scripting language itself
• A cmdlet is a single command that participates in the pipeline semantics of PowerShell. This includes binary (C#) cmdlets, advanced script functions, CDXML, and Workflows.
• Cmdlets perform an action and typically return a Microsoft .NET object to the next command in the pipeline
• The PowerShell runtime invokes these cmdlets within the context of automation scripts that are provided at the command line (also invokes them programmatically through PowerShell APIs)

Pipeline

• Pipeline is a command chain in which output of one command goes to next command as input

• A pipeline is a series of commands connected by pipeline operators (

  ) (ASCII 124)

  • Each pipeline operator sends the results of the preceding command to the next command.
• The output of the first command can be sent for processing as input to the second command, and so on…
• Details: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_pipelines

Command syntax

• PowerShell uses a Verb-Noun name pair to name cmdlets
  • The verb identifies the action that the cmdlet performs
  • the noun identifies the resource on which the cmdlet performs its action
• Example: Get-Xxx, Set-Xxx

Details: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_command_syntax

cmdlet info

#
# Get-Command cmdlet included in PowerShell is used to get all the cmdlets that are registered in the command shell
#
Get-Command # get all commands available
Get-Command -Noun <xyz> # get all commands that has <xyz> in it
Get-Command -Noun "Variable"

#
# Getting help about cmdlet
#
# Get-Help <cmdlet-name>
#
Get-Help Start-Service -Full
Get-Help Start-Service -Parameter *