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‎reference/5.1/Microsoft.PowerShell.Utility/Tee-Object.md‎

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external help file: Microsoft.PowerShell.Commands.Utility.dll-Help.xml
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Locale: en-US
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Module Name: Microsoft.PowerShell.Utility
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ms.date: 12/12/2022
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ms.date: 09/17/2025
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online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.utility/tee-object?view=powershell-5.1&WT.mc_id=ps-gethelp
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schema: 2.0.0
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aliases:
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## DESCRIPTION
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The `Tee-Object` cmdlet redirects output, that is, it sends the output of a command in two
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directions (like the letter T). It stores the output in a file or variable and also sends it down
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the pipeline. If `Tee-Object` is the last command in the pipeline, the command output is displayed
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at the prompt.
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The `Tee-Object` cmdlet write output in two directions. It stores the output in a file or variable
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and also sends it down the pipeline. If `Tee-Object` is the last command in the pipeline, the
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command output is displayed in the console.
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Internally, `Tee-Object` uses the `Set-Variable` and `Out-File` commands. These commands support the
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**WhatIf** parameter. The `Tee-Object` command doesn't support the **WhatIf** parameter. However, if
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you wrap `Tee-Object` in a script or function that support the **WhatIf** parameter, `Tee-Object`
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passes the state of **WhatIf** to the `Set-Variable` and `Out-File` commands.
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## EXAMPLES
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AllSystemFiles.txt file and passes the list down the pipeline to the `Out-File` cmdlet, which saves
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the list in the `NewSystemFiles.txt file`.
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### Example 4: Use `Tee-Object` in a script with the **WhatIf** parameter
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The `Tee-Object` command doesn't support the **WhatIf** parameter. However, if you wrap `Tee-Object`
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in a script or function that support the **WhatIf** parameter, `Tee-Object` passes the state of
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**WhatIf** to the `Set-Variable` and `Out-File` commands it uses internally.
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```powershell
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PS> function Test-Tee {
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[Cmdletbinding(SupportsShouldProcess)]
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Param()
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$true|tee -Variable b
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"Variable `$b is set to '$b'"
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}
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PS> Test-Tee
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True
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Variable $b is set to 'True'
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PS> Test-Tee -WhatIf
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True
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What if: Performing the operation "Set variable" on target "Name: b Value: True".
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Variable $b is set to ''
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```
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## PARAMETERS
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### -Append

‎reference/7.4/Microsoft.PowerShell.Utility/Tee-Object.md‎

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external help file: Microsoft.PowerShell.Commands.Utility.dll-Help.xml
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Locale: en-US
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Module Name: Microsoft.PowerShell.Utility
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ms.date: 04/25/2023
5+
ms.date: 09/17/2025
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online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.utility/tee-object?view=powershell-7.4&WT.mc_id=ps-gethelp
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schema: 2.0.0
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aliases:
@@ -37,10 +37,14 @@ Tee-Object [-InputObject <PSObject>] -Variable <String> [<CommonParameters>]
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## DESCRIPTION
3939

40-
The `Tee-Object` cmdlet redirects output, that is, it sends the output of a command in two
41-
directions (like the letter T). It stores the output in a file or variable and also sends it down
42-
the pipeline. If `Tee-Object` is the last command in the pipeline, the command output is displayed
43-
at the prompt.
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The `Tee-Object` cmdlet write output in two directions. It stores the output in a file or variable
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and also sends it down the pipeline. If `Tee-Object` is the last command in the pipeline, the
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command output is displayed in the console.
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Internally, `Tee-Object` uses the `Set-Variable` and `Out-File` commands. These commands support the
45+
**WhatIf** parameter. The `Tee-Object` command doesn't support the **WhatIf** parameter. However, if
46+
you wrap `Tee-Object` in a script or function that support the **WhatIf** parameter, `Tee-Object`
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passes the state of **WhatIf** to the `Set-Variable` and `Out-File` commands.
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## EXAMPLES
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Finally, the example prints the names of the files in the folder that have a defined front matter
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metadata block.
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### Example 5: Use `Tee-Object` in a script with the **WhatIf** parameter
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The `Tee-Object` command doesn't support the **WhatIf** parameter. However, if you wrap `Tee-Object`
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in a script or function that support the **WhatIf** parameter, `Tee-Object` passes the state of
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**WhatIf** to the `Set-Variable` and `Out-File` commands it uses internally.
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```powershell
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PS> function Test-Tee {
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[Cmdletbinding(SupportsShouldProcess)]
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Param()
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$true|tee -Variable b
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"Variable `$b is set to '$b'"
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}
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PS> Test-Tee
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True
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Variable $b is set to 'True'
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PS> Test-Tee -WhatIf
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True
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What if: Performing the operation "Set variable" on target "Name: b Value: True".
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Variable $b is set to ''
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```
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## PARAMETERS
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### -Append

‎reference/7.5/Microsoft.PowerShell.Utility/Tee-Object.md‎

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external help file: Microsoft.PowerShell.Commands.Utility.dll-Help.xml
33
Locale: en-US
44
Module Name: Microsoft.PowerShell.Utility
5-
ms.date: 04/25/2023
5+
ms.date: 09/17/2025
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online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.utility/tee-object?view=powershell-7.5&WT.mc_id=ps-gethelp
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schema: 2.0.0
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aliases:
@@ -37,10 +37,14 @@ Tee-Object [-InputObject <PSObject>] -Variable <String> [<CommonParameters>]
3737

3838
## DESCRIPTION
3939

40-
The `Tee-Object` cmdlet redirects output, that is, it sends the output of a command in two
41-
directions (like the letter T). It stores the output in a file or variable and also sends it down
42-
the pipeline. If `Tee-Object` is the last command in the pipeline, the command output is displayed
43-
at the prompt.
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The `Tee-Object` cmdlet write output in two directions. It stores the output in a file or variable
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and also sends it down the pipeline. If `Tee-Object` is the last command in the pipeline, the
42+
command output is displayed in the console.
43+
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Internally, `Tee-Object` uses the `Set-Variable` and `Out-File` commands. These commands support the
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**WhatIf** parameter. The `Tee-Object` command doesn't support the **WhatIf** parameter. However, if
46+
you wrap `Tee-Object` in a script or function that support the **WhatIf** parameter, `Tee-Object`
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passes the state of **WhatIf** to the `Set-Variable` and `Out-File` commands.
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## EXAMPLES
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@@ -151,6 +155,31 @@ and comparing that string to `$frontMatterPattern`.
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Finally, the example prints the names of the files in the folder that have a defined front matter
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metadata block.
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### Example 5: Use `Tee-Object` in a script with the **WhatIf** parameter
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The `Tee-Object` command doesn't support the **WhatIf** parameter. However, if you wrap `Tee-Object`
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in a script or function that support the **WhatIf** parameter, `Tee-Object` passes the state of
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**WhatIf** to the `Set-Variable` and `Out-File` commands it uses internally.
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```powershell
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PS> function Test-Tee {
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[Cmdletbinding(SupportsShouldProcess)]
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Param()
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$true|tee -Variable b
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"Variable `$b is set to '$b'"
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}
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PS> Test-Tee
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True
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Variable $b is set to 'True'
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PS> Test-Tee -WhatIf
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True
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What if: Performing the operation "Set variable" on target "Name: b Value: True".
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Variable $b is set to ''
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```
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## PARAMETERS
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### -Append

‎reference/7.6/Microsoft.PowerShell.Utility/Tee-Object.md‎

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Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@
22
external help file: Microsoft.PowerShell.Commands.Utility.dll-Help.xml
33
Locale: en-US
44
Module Name: Microsoft.PowerShell.Utility
5-
ms.date: 04/25/2023
5+
ms.date: 09/17/2025
66
online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.utility/tee-object?view=powershell-7.6&WT.mc_id=ps-gethelp
77
schema: 2.0.0
88
aliases:
@@ -37,10 +37,14 @@ Tee-Object [-InputObject <PSObject>] -Variable <String> [<CommonParameters>]
3737

3838
## DESCRIPTION
3939

40-
The `Tee-Object` cmdlet redirects output, that is, it sends the output of a command in two
41-
directions (like the letter T). It stores the output in a file or variable and also sends it down
42-
the pipeline. If `Tee-Object` is the last command in the pipeline, the command output is displayed
43-
at the prompt.
40+
The `Tee-Object` cmdlet write output in two directions. It stores the output in a file or variable
41+
and also sends it down the pipeline. If `Tee-Object` is the last command in the pipeline, the
42+
command output is displayed in the console.
43+
44+
Internally, `Tee-Object` uses the `Set-Variable` and `Out-File` commands. These commands support the
45+
**WhatIf** parameter. The `Tee-Object` command doesn't support the **WhatIf** parameter. However, if
46+
you wrap `Tee-Object` in a script or function that support the **WhatIf** parameter, `Tee-Object`
47+
passes the state of **WhatIf** to the `Set-Variable` and `Out-File` commands.
4448

4549
## EXAMPLES
4650

@@ -151,6 +155,31 @@ and comparing that string to `$frontMatterPattern`.
151155
Finally, the example prints the names of the files in the folder that have a defined front matter
152156
metadata block.
153157

158+
### Example 5: Use `Tee-Object` in a script with the **WhatIf** parameter
159+
160+
The `Tee-Object` command doesn't support the **WhatIf** parameter. However, if you wrap `Tee-Object`
161+
in a script or function that support the **WhatIf** parameter, `Tee-Object` passes the state of
162+
**WhatIf** to the `Set-Variable` and `Out-File` commands it uses internally.
163+
164+
```powershell
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PS> function Test-Tee {
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[Cmdletbinding(SupportsShouldProcess)]
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Param()
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$true|tee -Variable b
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"Variable `$b is set to '$b'"
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}
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PS> Test-Tee
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True
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Variable $b is set to 'True'
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PS> Test-Tee -WhatIf
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True
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What if: Performing the operation "Set variable" on target "Name: b Value: True".
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Variable $b is set to ''
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```
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## PARAMETERS
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### -Append

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