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Overview of Management Tools
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Understanding Cmdlet Output Objects
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It is important to understand the object that is returned by a cmdlet so that you can perform additional processing on the object if you want to do so . The Get-ChildItem command, which lists the name and last write time of all the directories on the root drive, is shown here . This code is a single command that is broken at the pipeline character for readability .
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PS C:\> Get-ChildItem | Where-Object { $_.mode -like 'd*' } | Select-Object -Property Name, LastWriteTime
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The results of the Get-ChildItem command are shown in Figure 13-18 .
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FIgURE 13-18 You can reduce the information returned from a command by using the
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Select-Object cmdlet .
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You can reduce the typing without sacrificing any of the readability of the command by using dir as the alias for Get-ChildItem, Where as the alias for Where-Object, and Select as the alias for Select-Object . You can also omit the property parameter, because it is the default parameter for the Select-Object cmdlet . The revised command is shown here .
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PS C:\> dir | where { $_.mode -like 'd*'} | select name, lastwritetime
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Another way to produce a listing of the name and the last write time of each directory in the root directory is to send the output to the Format-Table cmdlet, as illustrated here .
PS C:\> Get-ChildItem | Where-Object { $_.mode -like 'd*' } | Format-Table -Property Name, LastWriteTime
The output produced by using the Format-Table cmdlet is almost the same as the output produced by using the Select-Object cmdlet . This is seen in Figure 13-19 .
Introduction to Windows PowerShell Scripting
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FIgURE 13-19 By using the Format-Table cmdlet, you can create almost the same results as the output
produced by the Select-Object cmdlet .
The problem with using Format-Table to format your output is that if you have to do anything else to the data, you are left with a series of five different format objects that are basically useless for additional data manipulation . Depending on what you are trying to achieve, even the custom Windows PowerShell object that is created by the Select-Object cmdlet will cause you problems . As a best practice, you should always perform all data manipulation before sending your object to an output cmdlet . At this point, you have one last thing that you can do easily in your pipeline send the output to a text file . The easiest way to do this is to use the >> redirection operator as shown here (once again, the single command is broken at the pipeline character for readability) .
PS C:\> Get-ChildItem | Where-Object { $_.mode -like 'd*' } | Format-Table -Property Name, LastWriteTime >> c:\fso\directoryFile.txt
The text file that is produced by the redirection operator maintains the format that is displayed on the console . This is seen in Figure 13-20 .
FIgURE 13-20 The redirection operator maintains formatting seen on the Windows PowerShell console .
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Overview of Management Tools
This concludes our overview of using Windows PowerShell to simplify working with directories and files .
Scripting Fundamentals
In its most basic form, a Windows PowerShell script is a collection of Windows PowerShell commands, such as the following .
Get-Process notepad | Stop-Process
You can put that command into a Windows PowerShell script and run it directly as it is written . The StopNotepad .ps1 script is shown in Figure 13-21 .
FIgURE 13-21 StopNotepad .ps1 script seen in Notepad
To create a Windows PowerShell script, you only have to copy the command in a text file and save the file by using a .ps1 extension . If you double-click the file, it will open with the graphical version of Windows PowerShell . The graphical version of Windows PowerShell is called Windows PowerShell ISE .
Running Windows powerShell Scripts
To run the script, if you are running Windows XP or Windows Server 2003, you can open the Windows PowerShell console and drag the file to the console . In Windows Vista, the capability of dragging to a command line was removed due to potential security implications . To replace it, Windows Vista introduced a very helpful command that you can use instead: the Copy As Path command . You hold down the Shift key, right-click the PS1 file, and select Copy As Path from the action menu shown in Figure 13-22 .
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