Write-Output

Sends the specified objects to the next command in the pipeline. If the command is the last command in the pipeline, the objects are displayed in the console.

Syntax

Write-Output
     [-InputObject] <PSObject[]>
     [-NoEnumerate]
     [<CommonParameters>]

Description

The Write-Output cmdlet sends the specified object down the pipeline to the next command. If the command is the last command in the pipeline, the object is displayed in the console.

Write-Output sends objects down the primary pipeline, also known as the "output stream" or the "success pipeline." To send error objects down the error pipeline, use Write-Error.

This cmdlet is typically used in scripts to display strings and other objects on the console. One of the built-in aliases for Write-Output is echo and similar to other shells that use echo, the default behavior is to display the output at the end of a pipeline. In PowerShell, it is generally not necessary to use the cmdlet in instances where the output is displayed by default. For example, Get-Process | Write-Output is equivalent to Get-Process. Or, echo "Home directory: $HOME" can be written, "Home directory: $HOME".

By default, Write-Output enumerates through collections provided to the cmdlet. However, Write-Output can also be used to pass collections down the pipeline as a single object with the NoEnumerate parameter.

Examples

Example 1: Get objects and write them to the console

$P = Get-Process
Write-Output $P

The first command gets processes running on the computer and stores them in the $P variable.

The second and third commands display the process objects in $P on the console.

Example 2: Pass output to another cmdlet

Write-Output "test output" | Get-Member

This command pipes the "test output" string to the Get-Member cmdlet, which displays the members of the System.String class, demonstrating that the string was passed along the pipeline.

Example 3: Suppress enumeration in output

Write-Output 1,2,3 | Measure-Object

Count    : 3
...

Write-Output 1,2,3 -NoEnumerate | Measure-Object

Count    : 1
...

This command adds the NoEnumerate parameter to treat a collection or array as a single object through the pipeline.

Parameters

-InputObject

Specifies the objects to send down the pipeline. Enter a variable that contains the objects, or type a command or expression that gets the objects.

Type:PSObject[]
Position:0
Default value:None
Accept pipeline input:True
Accept wildcard characters:False
-NoEnumerate

By default, the Write-Output cmdlet always enumerates its output. The NoEnumerate parameter suppresses the default behavior, and prevents Write-Output from enumerating output. The NoEnumerate parameter has no effect if the command is wrapped in parentheses, because the parentheses force enumeration. For example, (Write-Output 1,2,3) still enumerates the array.

Note

This switch only works correctly with PowerShell Core 6.2 and newer. On older versions of PowerShell Core, the collection is still enumerated even with use of this switch.

Type:SwitchParameter
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False

Inputs

PSObject

You can pipe objects to Write-Output.

Outputs

PSObject

Write-Output returns the objects that are submitted as input.