Get-Alias

Return alias names for Cmdlets. By default, Get-Alias takes an alias and returns the command name. With the -Definition parameter set, Get-Alias
will accept a command name and return its alias.

Syntax
      Get-Alias [ [-Name] string[] ]
         [-scope string] [-exclude string[] ] [CommonParameters]

      Get-Alias [-Definition string[]]
         [-scope string] [-exclude string[] ] [CommonParameters]

Key
   -Name string[]
       The alias to retrieve. By default, all aliases defined for the current session.
       (the "-Name" is optional)

   -Definition string[]
       Get the aliases for the specified item.
       Enter the name of a cmdlet, function, script, file, or executable.

       The alias object contains a property called 'Definition' which
       holds this information for each Alias.

   -scope string
       The scope in which this alias is valid. 
       Valid values are "Global", "Local", or "Script", or a number relative
       to the current scope ( 0 through the number of scopes, where 0 is the
       current scope and 1 is its parent). "Local" is the default.
       For more, type "get-help about_scope".

   -exclude string[]
       Omit the specified items, wildcards allowed e.g. "*ms*"

   CommonParameters:
       -Verbose, -Debug, -ErrorAction, -ErrorVariable, -WarningAction, -WarningVariable,
       -OutBuffer -OutVariable.

You can also view aliases via the Alias provider that exposes a drive called Alias: much like a file system drive:

Set-Location alias:
Get-Childitem

Examples

Retrieve all aliases for the current session, displaying the cmdlet and the alias name:

PS C:\> get-alias

Retrieve all aliases that start with the letter S

PS C:\> get-alias -name s*

Retrieve all aliases that reference the Set-Location cmdlet :

PS C:\> get-alias | where-object {$_.Definition -match "Set-Location"}

Retrieve all built-in aliases (these have the ReadOnly option set):

PS C:\> get-alias | where-object {$_.Options -match "ReadOnly"}

#There are places I remember
All my life, though some have changed# - The Beatles (In My Life)

Related:

export-alias epal Export an alias list to a file
import-alias - Import an alias list from a file
new-alias - Create a new Cmdlet-alias pairing
set-alias - Map an alias to a Cmdlet