Get-Command

Get basic information about PowerShell commands: cmdlets, files and functions.

Syntax
      Get-Command [-noun string[ ]] [-verb string[]]
         [[-argumentList] Object[]] [-totalCount int]
            [-Module string[]] [-syntax] [CommonParameters]

      Get-Command [[-name] string[]] [[-argumentList] Object[]]
         [-commandType {CommandTypes}]  [-totalCount int]
            [-Module string[]] [-syntax] [CommonParameters]

key
   -name
       Get information for cmdlets (or command elements) with this name.
       All or part of the name, wildcards are permitted.
        
   -verb
       Get information for cmdlet names that include the specified verb.
       String  "Get", "Set", "Remove" etc.  Wildcards are permitted and multiple
       verbs or verb patterns can be specified: "*et".
        
   -noun
       Get information for cmdlet names that include the specified noun.
       "process", "Service", "Variable" etc. Wildcards are permitted:"*item*"
        
   -commandType CommandTypes
       Get only specified types of command objects:

             Alias              Powershell Alias
             All                       
             Application        All non-PowerShell files in the PowerShell path.
             Cmdlet             Powershell Cmdlet (default)
             ExternalScript
             Filter             All PowerShell functions
             Functon            All PowerShell functions
             Script
                
       You can use -CommandType or its alias, -Type.
        
   -totalCount int
       Count the number of items retrieved.

   -Module string[]
       Get the commands that came from the specified modules or snap-ins.
        Enter the names of modules or snap-ins, or enter snap-in/module object name(s).

        You can use -Module, or its alias, -PSSnapin.

        This parameter takes string values, or a PSModuleInfo or PSSnapinInfo object, such as the 
        objects returned by Get-Module, Get-PSSnapin, and Import-PSSession.

   -syntax
       Describes the item:
       alias name, cmdlet syntax, function definition, filter definition,
       script path/filename.

   -argumentList
       Get information about a cmdlet when it is used with a specific argument,
       such as a file path or a registry key. e.g., "HKML\Software" or "cert:\my".
       This is useful because some cmdlet parameters are added dynamically.
        
   CommonParameters:
       -Verbose, -Debug, -ErrorAction, -ErrorVariable, -WarningAction, -WarningVariable,
       -OutBuffer -OutVariable.

Get-Command gets its data directly from the code of a cmdlet, function, script, or alias, unlike Get-Help, which gets its information from help topic files.

The -Module parameter will find the commands added to the session by adding a PowerShell snap-in or importing a module.

To list commands with the same -name in execution order, type the command name without wildcard characters.

Examples

Describe the 'Set' verbs:

PS C:\> get-command -verb set | format-list
PS C:\> get-command -verb set | format list *

Display cmdlets in noun-based groups:

PS C:\> get-command | sort-object noun | format-table -group noun

Display all Active Directory cmdlets available to PowerShell:

PS C:\> get-command -module ActiveDirectory -verb get
PS C:\> get-command -module ActiveDirectory -noun ADUser

Retrieve information about all the elements available to PowerShell (all files, functions, aliases and cmdlets):

PS C:\> get-command *

Describe the alias 'dir':

PS C:\> get-command dir | format-list

Klinger: "Oh, you were built for command. Those shoulders -- broad enough for four stars. That height-- commanders should be tall--to look down on his men"
Corporal: "Napoleon didn't do so bad" - Dialogue from M*A*S*H 1978

Related:

Get-Help - Open the help file
Get-PSDrive - Get drive information (DriveInfo)
Get-Member - Enumerate the properties of an object
Equivalent bash command: man - Display helpful information about commands.