About Aliases
SHORT DESCRIPTION
Describes how to use alternate names for cmdlets and commands in PowerShell.
LONG DESCRIPTION
An alias is an alternate name or nickname for a cmdlet or for a command element, such as a function, script, file, or executable file. You can use the alias instead of the command name in any PowerShell commands.
To create an alias, use the New-Alias cmdlet. For example, the following
command creates the "gas" alias for the Get-AuthenticodeSignature cmdlet:
New-Alias -Name gas -Value Get-AuthenticodeSignature
After you create the alias for the cmdlet name, you can use the alias instead of the cmdlet name. For example, to get the Authenticode signature for the SqlScript.ps1 file, type:
Get-AuthenticodeSignature SqlScript.ps1
Or, type:
gas SqlScript.ps1
If you create "word" as the alias for Microsoft Office Word, you can type "word" instead of the following:
"C:\Program Files\Microsoft Office\Office11\Winword.exe"
BUILT-IN ALIASES
PowerShell includes a set of built-in aliases, including "cd" and "chdir" for the Set-Location cmdlet, and "ls" and "dir" for the Get-ChildItem cmdlet.
To get all the aliases on the computer, including the built-in aliases, type:
Get-Alias
ALIAS CMDLETS
PowerShell includes the following cmdlets, which are designed for working with aliases:
Get-Alias- Gets all the aliases in the current session.New-Alias- Creates a new alias.Set-Alias- Creates or changes an alias.Export-Alias- Exports one or more aliases to a file.Import-Alias- Imports an alias file into PowerShell.
For detailed information about the cmdlets, type:
Get-Help <cmdlet-Name> -Detailed
For example, type:
Get-Help Export-Alias -Detailed
CREATING AN ALIAS
To create a new alias, use the New-Alias cmdlet. For example, to create the "gh" alias for Get-Help, type:
New-Alias -Name gh -Value Get-Help
You can use the alias in commands, just as you would use the full cmdlet name, and you can use the alias with parameters.
For example, to get detailed Help for the Get-WmiObject cmdlet, type:
Get-Help Get-WmiObject -Detailed
Or, type:
gh Get-WmiObject -Detailed
SAVING ALIASES
The aliases that you create are saved only in the current session. To use the aliases in a different session, add the alias to your PowerShell profile. Or, use the Export-Alias cmdlet to save the aliases to a file.
For more information, type:
Get-Help about_Profiles
GETTING ALIASES
To get all the aliases in the current session, including the built-in aliases, the aliases in your PowerShell profiles, and the aliases that you have created in the current session, type:
Get-Alias
To get particular aliases, use the Name parameter of the Get-Alias cmdlet. For example, to get aliases that begin with "p", type:
Get-Alias -Name p*
To get the aliases for a particular item, use the Definition parameter. For example, to get the aliases for the Get-ChildItem cmdlet type:
Get-Alias -Definition Get-ChildItem
GET-ALIAS OUTPUT
Get-Alias returns only one type of object, an AliasInfo object (System.Management.Automation.AliasInfo). The name of aliases that don't include a hyphen, such as "cd" are displayed in the following format:
PS C:\> Get-Alias ac
CommandType Name Version Source
----------- ---- ------- ------
Alias ac -> Add-Content
This makes it very quick and easy to get the information that you need.
The arrow-based alias name format is not used for aliases that include a hyphen. These are likely to be preferred substitute names for cmdlets and functions, instead of typical abbreviations or nicknames, and the author might not want them to be as evident.
ALTERNATE NAMES FOR COMMANDS WITH PARAMETERS
You can assign an alias to a cmdlet, script, function, or executable file. You
cannot assign an alias to a command and its parameters. For example, you can
assign an alias to the Get-Eventlog cmdlet, but you cannot assign an alias
to the Get-Eventlog -LogName System command.
You can create a function that includes the command. To create a function, type the word "function" followed by a name for the function. Type the command, and enclose it in braces ({}).
For example, the following command creates the syslog function. This function
represents the Get-Eventlog -LogName System command:
function Get-SystemEventlog {Get-Eventlog -LogName System}
Set-Alias -Name syslog -Value Get-SystemEventlog
You can now type "syslog" instead of the command. And, you can create aliases for the new function.
For more information about functions, type:
Get-Help about_Functions
ALIAS OBJECTS
PowerShell aliases are represented by objects that are instances of the System.Management.Automation.AliasInfo class. For more information about this type of object, see AliasInfo Class in the Microsoft Developer Network (MSDN) library.
To view the properties and methods of the alias objects, get the aliases. Then, pipe them to the Get-Member cmdlet. For example:
Get-Alias | Get-Member
To view the values of the properties of a specific alias, such as the dir
alias, get the alias. Then, pipe it to the Format-List cmdlet. For example,
the following command gets the "dir" alias. Next, the command pipes the alias
to the Format-List cmdlet. Then, the command uses the Property parameter of
Format-List with a wildcard character (*) to display all the properties of
the dir alias. The following command performs these tasks:
Get-Alias -Name dir | Format-List -Property *
PowerShell ALIAS PROVIDER
PowerShell includes the Alias provider. The Alias provider lets you view the aliases in PowerShell as though they were on a file system drive.
The Alias provider exposes the Alias: drive. To go into the Alias: drive, type:
Set-Location Alias:
To view the contents of the drive, type:
Get-ChildItem
To view the contents of the drive from another PowerShell drive, begin the path with the drive name. Include the colon (:). For example:
Get-ChildItem -Path Alias:
To get information about a particular alias, type the drive name and the alias name. Or, type a name pattern. For example, to get all the aliases that begin with "p", type:
Get-ChildItem -Path Alias:p*
For more information about the PowerShell Alias provider, type:
Get-Help Alias