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In many instances, the command host is more useful, particularly if there are multiple lines of output In the graphical environment, each line of output will appear as a separate dialog box; this gets cumbersome and soon becomes painful for your clicking nger To set the default host to be the command host run command, do the following:
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C:\>cscript //H:cscript Microsoft (R) Windows Script Host Version 57 Copyright (C) Microsoft Corporation All rights reserved The default script host is now set to cscriptexe
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To switch back to wscript as the default, and therefore, the graphical host run command, do the following:
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C:\>wscript //H:wscript
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22 THE COMMAND PROMPT AND POWERSHELL
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An in-depth look at the VBScript language is beyond the scope of this book; however, let s look at some of its common tasks because, as an Administrator, you will nd yourself challenged with a task where a script might be the right answer First, like a batch le, you probably want to pass parameters to the script Arguments are accessed via the array WscriptArguments(), where the number in the bracket is the element of the array For example, WscriptArguments(0) is the rst argument to the script; to check the total number of arguments, use the Count function of an array, such as WscriptArgumentsCount This is useful at the start of a script that expects a certain number of arguments to make sure they were passed For example:
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' Check all arguments required have been passed If WscriptArgumentsCount < 1 Then WscriptEcho Arguments required For example: & vbCrLf _ & cscript helloworldvbs worldname WscriptQuit(0) End If WscriptEcho Hello & WscriptArguments(0)
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Notice that the rst line is a comment (A comment is anything after the apostrophe character [']) A check is performed to ensure that the number of arguments is not less than one; if there are less than one, a message is displayed describing the correct syntax Then the script exited via the WscriptQuit(0) function If a planet is passed, it will not run the quit and write to screen Hello with the passed planet (In this example, the script is not smart enough to point out that Pluto is, in fact, not a proper planet, just a dwarf one) For example:
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D:\temp>helloworldvbs pluto Microsoft (R) Windows Script Host Version 57
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22
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Copyright (C) Microsoft Corporation All rights reserved Hello Pluto
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Some of the most common actions you perform with a script are to communicate with the Windows Management Instrumentation (WMI) to look at information on a local or remote computer Let s start with a script to get the operating system information about a machine:
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strComputer = "" Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2") Set colOperatingSystems = objWMIServiceExecQuery("Select * from Win32_OperatingSystem") For Each objOperatingSystem in colOperatingSystems WScriptEcho "Name - " & objOperatingSystemCaption WScriptEcho "Architecture - " & objOperatingSystemOSArchitecture WScriptEcho "OS Build - " & objOperatingSystemVersion WScriptEcho "Windows Directory - " & objOperatingSystemWindowsDirectory Next
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Looking at this script, rst create a variable named strComputer, which has a value of a period () This means the local machine WMI instance that is, the information you query from WMI will be gleaned from the local machine that is executing the script Don t define strComputer in advance A variable is required in some languages to be de ned in advance, but not VBScript You can create variables as needed in VBScript; however, good programming practice encourages you to de ne variables at the start of the program to help make the code more understandable and to remove the possibility of errors in the code Next, the objWMIService variable is created It s set to point to an object that points to the WMI service and the \root\cimv2 namespace There are other namespaces, such as SECURITY, but this list will vary based on the OS and other software that might be installed
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