PowerShell脚本为特定值选择

Question

如何在PowerShell显示中获取特定值？

示例 - 当我在脚本下执行时，我得到6个值，我只需要获取第4行值。

命令：

Get-WmiObject win32_logicaldisk -Filter "Drivetype=3 

输出：

 
DeviceID  : C: 
DriveType : 3 
ProviderName : 
FreeSpace : 183760687104 
Size   : 255791026176 
VolumeName : 

我需要获取唯一 “183760687104” 的价值。如何实现它。我也不想拥有FreeSpace标签。只是简单的值“183760687104”。

Answer 1

你只需按名称访问字段：

(Get-WmiObject Win32_LogicalDisk -Filter "Drivetype=3").FreeSpace 

注意Get-WmiObject已被弃用，你应该使用Get-CimInstance代替。

(Get-CimInstance Win32_LogicalDisk -Filter "Drivetype=3").FreeSpace 

如果你想保存在一个变量的值，只是为它分配：

$freespace = (Get-CimInstance Win32_LogicalDisk -Filter "Drivetype=3").FreeSpace 

，然后根据你愿意，你可以使用$freespace。但要小心，因为在具有多个本地磁盘的系统上，您的表达式将返回一个值数组而不仅仅是一个值，因此您可能希望为结果添加下标以仅选择第一个磁盘。这两种表达式都将是肯定给你一个数字：

PS C:\Users\User> (Get-CimInstance Win32_LogicalDisk -Filter "Drivetype=3").FreeSpace[0] 
94229651456 
PS C:\Users\User> (Get-CimInstance Win32_LogicalDisk -Filter "Drivetype=3")[0].FreeSpace 
94239125504 

如果你曾经在一个对象，只是管的表达上可用的字段疑问通过gm（简称Get-Member）：

Get-CimInstance Win32_LogicalDisk -Filter "Drivetype=3" | gm 

将列出所有可用的字段。

PS C:\Users\User> Get-CimInstance Win32_LogicalDisk -Filter "Drivetype=3" | gm 


    TypeName: Microsoft.Management.Infrastructure.CimInstance#root/cimv2/Win32_LogicalDisk 

Name       MemberType Definition 
----       ---------- ---------- 
Clone      Method  System.Object ICloneable.Clone() 
Dispose      Method  void Dispose(), void IDisposable.Dispose() 
Equals      Method  bool Equals(System.Object obj) 
GetCimSessionComputerName Method  string GetCimSessionComputerName() 
GetCimSessionInstanceId  Method  guid GetCimSessionInstanceId() 
GetHashCode     Method  int GetHashCode() 
GetObjectData    Method  void GetObjectData(System.Runtime.Serialization.SerializationInfo info, Sys... 
GetType      Method  type GetType() 
ToString      Method  string ToString() 
Access      Property uint16 Access {get;} 
Availability     Property uint16 Availability {get;} 
BlockSize     Property uint64 BlockSize {get;} 
Caption      Property string Caption {get;} 
Compressed     Property bool Compressed {get;} 
ConfigManagerErrorCode  Property uint32 ConfigManagerErrorCode {get;} 
ConfigManagerUserConfig  Property bool ConfigManagerUserConfig {get;} 
CreationClassName   Property string CreationClassName {get;} 
Description     Property string Description {get;} 
DeviceID      Property string DeviceID {get;} 
DriveType     Property uint32 DriveType {get;} 
ErrorCleared     Property bool ErrorCleared {get;} 
ErrorDescription    Property string ErrorDescription {get;} 
ErrorMethodology    Property string ErrorMethodology {get;} 
FileSystem     Property string FileSystem {get;} 
FreeSpace     Property uint64 FreeSpace {get;} 
InstallDate     Property CimInstance#DateTime InstallDate {get;} 
LastErrorCode    Property uint32 LastErrorCode {get;} 
MaximumComponentLength  Property uint32 MaximumComponentLength {get;} 
MediaType     Property uint32 MediaType {get;} 
Name       Property string Name {get;} 
NumberOfBlocks    Property uint64 NumberOfBlocks {get;set;} 
PNPDeviceID     Property string PNPDeviceID {get;} 
PowerManagementCapabilities Property uint16[] PowerManagementCapabilities {get;} 
PowerManagementSupported  Property bool PowerManagementSupported {get;} 
ProviderName     Property string ProviderName {get;} 
PSComputerName    Property string PSComputerName {get;} 
Purpose      Property string Purpose {get;} 
QuotasDisabled    Property bool QuotasDisabled {get;} 
QuotasIncomplete    Property bool QuotasIncomplete {get;} 
QuotasRebuilding    Property bool QuotasRebuilding {get;} 
Size       Property uint64 Size {get;} 
Status      Property string Status {get;} 
StatusInfo     Property uint16 StatusInfo {get;} 
SupportsDiskQuotas   Property bool SupportsDiskQuotas {get;} 
SupportsFileBasedCompression Property bool SupportsFileBasedCompression {get;} 
SystemCreationClassName  Property string SystemCreationClassName {get;} 
SystemName     Property string SystemName {get;} 
VolumeDirty     Property bool VolumeDirty {get;} 
VolumeName     Property string VolumeName {get;set;} 
VolumeSerialNumber   Property string VolumeSerialNumber {get;} 
PSStatus      PropertySet PSStatus {Status, Availability, DeviceID, StatusInfo}