Introduction to Windows PowerShell Select
These are three way that PowerShell uses ‘Select’:
- Perhaps the most common way is in a WMI Query Language (WQL) statement. For example, Get-WmiObject uses ‘-query’ to introduce a classic ‘Select * from’ a phrase, see example 1
- The second context for ‘Select’ in PowerShell is Select-String. This cmdlet not only opens a file, but also checks for a word, a phrase, or in fact any pattern match.
- Another use is Select-Object, which is often abbreviated to plain Select. In this case Select is used to choose the columns displayed in the output.
This WMI example employs the Win32_logicaldisk class to display volumes with DriveType =3. A value of 3 means local and non-removable. See how Select * feeds off Get-WmiObject -query.
# PowerShell Select Statement
Get-WmiObject -query `
"Select * from Win32_logicaldisk where DriveType =’3’" `
| Format-Table -auto
Example 2 Check to See if Windows Remoting is Running
Here is another example of a WMI Query Language (WQL) statement using ‘Select’.
# PowerShell Select * remoting services
"Select * from Win32_service where name=’WinRM’ "
Note 2: WinRm is the Windows service which is a prerequisite for PowerShell v 2.0’s remoting capabilities.
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This script filters the event logs for two properties, log = Application and type = Error; furthermore this PowerShell script formats the output into a table.
# Powershell Select Example from Event Logs
$Logs = Get-WmiObject -query `
"SELECT * FROM Win32_NTLogEvent WHERE (logfile=’system’) AND (type=’error’)"
$Logs | Format-Table EventCode, SourceName, Message -auto
Summary of PowerShell Select
This page deals with PowerShell ‘Select’ as in is in a WMI Query Language (WQL) statement. For instance, Get-WmiObject uses ‘-query’ to introduce a classic ‘Select * from’ a phrase.
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