• Remove-Variable in Windows command line


    Deletes a variable and its value.

    Syntax

    PowerShell
    Remove-Variable
          [-Name] <String[]>
          [-Include <String[]>]
          [-Exclude <String[]>]
          [-Force]
          [-Scope <String>]
          [-WhatIf]
          [-Confirm]
          [<CommonParameters>]

    Description

    The Remove-Variable cmdlet deletes a variable and its value from the scope in which it is defined, such as the current session. You cannot use this cmdlet to delete variables that are set as constants or those that are owned by the system.

    Examples

    Example 1: Remove a variable

    PowerShell
    Remove-Variable Smp

    This command deletes the $Smp variable.

    Parameters

    -Confirm

    Prompts you for confirmation before running the cmdlet.

    TABLE 1
    Type: SwitchParameter
    Aliases: cf
    Position: Named
    Default value: False
    Accept pipeline input: False
    Accept wildcard characters: False
    -Exclude

    Specifies an array of items that this cmdlet omits from the operation. The value of this parameter qualifies the Name parameter. Enter a name element or pattern, such as "s*". Wildcards are permitted.

    TABLE 2
    Type: String[]
    Position: Named
    Default value: None
    Accept pipeline input: False
    Accept wildcard characters: True
    -Force

    Indicates that the cmdlet removes a variable even if it is read-only. Even using the Force parameter, the cmdlet cannot remove a constant.

    TABLE 3
    Type: SwitchParameter
    Position: Named
    Default value: None
    Accept pipeline input: False
    Accept wildcard characters: False
    -Include

    Specifies an array of items that this cmdlet deletes in the operation. The value of this parameter qualifies the Name parameter. Enter a name element or pattern, such as s*. Wildcards are permitted.

    TABLE 4
    Type: String[]
    Position: Named
    Default value: None
    Accept pipeline input: False
    Accept wildcard characters: True
    -Name

    Specifies the name of the variable to be removed. The parameter name (Name) is optional. Wildcards are permitted

    TABLE 5
    Type: String[]
    Position: 0
    Default value: None
    Accept pipeline input: True
    Accept wildcard characters: True
    -Scope

    Gets only the variables in the specified scope. The acceptable values for this parameter are:

    • Global
    • Local
    • Script
    • 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 information, see about_Scopes.

    TABLE 6
    Type: String
    Position: Named
    Default value: None
    Accept pipeline input: False
    Accept wildcard characters: False
    -WhatIf

    Shows what would happen if the cmdlet runs. The cmdlet is not run.

    TABLE 7
    Type: SwitchParameter
    Aliases: wi
    Position: Named
    Default value: False
    Accept pipeline input: False
    Accept wildcard characters: False

    Inputs

    PSVariable

    You can pipe a variable object to Remove-Variable.

    Outputs

    None

    This cmdlet does not return any output.

    Notes

    • Changes affect only the current scope, such as a session. To delete a variable from all sessions, add a Remove-Variable command to your PowerShell profile.

    • You can also refer to Remove-Variable by its built-in alias, rv. For more information, see about_Aliases.

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  • 原文地址:https://www.cnblogs.com/kungfupanda/p/13599734.html
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