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Windows Server

Command Line WMI: Formatting Data

In the last few articles, we’ve been learning how to take advantage of Windows Management Instrumentation, or WMI. Specifically, in part one we we looked at basic syntax and querying for the local computer, discovering ways to gather WMI information using the command line tool WMIC. In part two, we learned how to query remote machines and work with WMIC right from the command line.

Now, in part three, we’ll take a closer look at some advanced ways of formatting data.

If you’ve been following along, you’ve seen me use expressions like this to format the output:

 

wmic:root\cli>cpu list brief /format:list

Caption=Intel64 Family 6 Model 30 Stepping 5
DeviceID=CPU0
Manufacturer=GenuineIntel
MaxClockSpeed=1600
Name=Intel(R) Core(TM) i7 CPU       Q 720  @ 1.60GHz
SocketDesignation=CPU 1

Otherwise, WMIC would have displayed everything as one long line. But where did I discover /format? This option is a switch parameter for GET and LIST. Run a command like this, using any alias:

wmic:root\cli>os list /?

You’ll see a list of switch parameters. Each of these has its own help.

wmic:root\cli>os list /format /?

Keyword/XSL filename to process XML results.
USAGE:

/FORMAT:
NOTE:  : ((| : )[,]).
where :((=)[:]).

NOTE:  is a  or an .

Keywords:

CSV
HFORM
HTABLE
LIST
MOF
RAWXML
TABLE
VALUE
XML
htable-sortby
htable-sortby.xsl
texttablewsys
texttablewsys.xsl
wmiclimofformat
wmiclimofformat.xsl
wmiclitableformat
wmiclitableformat.xsl
wmiclitableformatnosys
wmiclitableformatnosys.xsl
wmiclivalueformat
wmiclivalueformat.xsl

You’ve already seen me use a list and table as the default. What about creating a CSV file?

wmic:root\cli>logicaldisk where drivetype=3 get Name,Size,Freespace,SystemName /format:csv

Node,FreeSpace,Name,Size,SystemName
SERENITY,64002703360,C:,487439986688,SERENITY
SERENITY,5952987136,E:,120031539200,SERENITY
SERENITY,276582162432,G:,1000202035200,SERENITY

Actually, this didn’t create the file, only formatted the output. But not a problem based on what I covered in the last article.

wmic:root\cli>/output:"c:\work\disks.csv" logicaldisk where drivetype=3 get Name,Size,Freespace,SystemName /format:csv

Unfortunately, this ends up inserting a blank line at the beginning of the file, which could be problematic depending on how you need to use it. But it takes not much more effort to save all information from a list of computers to a CSV file.

wmic:root\cli>/node:@computers.txt /output:"c:\work\diskreport.csv" logicaldisk where drivetype=3 get /format:csv

How about creating an XML document? Looking at help, you’ll see two XML related options. I would suggest a command like this:

wmic:root\cli>/node:quark /output:"c:\work\quarksvc.xml" service list brief /format:rawxml

Or how about creating a quick and dirty HTML report?

wmic:root\cli>/output:"c:\work\volume.html" volume list brief /format:hform

This will create an HTML page like Figure 1:

A WMIC Generated HTML Form

Figure 1 A WMIC Generated HTML Form
Or perhaps you’d prefer a table.
wmic:root\cli>/output:"c:\work\volume2.html" volume list brief /format:htable

A WMIC Generated HTML Table

Figure 2 A WMIC Generated HTML Table
All of these formats are controlled by XSL files you’ll find under C:\Windows\System32\WBEM, most likely in a localized subfolder like EN-US. I’ve never tried creating my own files, but you are welcome to modify these, after making a suitable backup of course.

I’ll wrap this up by creating a single HTML report that contains WMI information from 3 different classes. Because I’m in the interactive mode, the context will retain values for Output and and Append so I only need to enter them once.

wmic:root\cli>/Output:"c:\work\report.html" OS get /format:hform
wmic:root\cli>/Append:"c:\work\report.html"  computersystem get /format:hform
wmic:root\cli>service list brief /format:htable

Running this from the command prompt, I would be a bit more explicit and specify output and append parameters. In fact, here’s a batch file that demonstrates how you might want to use WMIC.

@echo off
if %1$==$ (
    rem use the localcomputername if nothing is specified
    set computer=%computername%
) else (
    rem use the computername passed as a parameter
    set computer=%1
)

echo Creating report for %computer%
set htmlfile=%computer%-report.html

rem redirect wmic output to NULL since we don't really need to see it
wmic /node:%computer% /Output:"%htmlfile%" OS get /format:hform >NULL
wmic /node:%computer% /Append:"%htmlfile%" computersystem get /format:hform >NULL
wmic /node:%computer% /Append:"%htmlfile%" service list brief /format:htable >NULL

echo See %htmlfile%

set computer=
set htmlfile=

The batch file takes a computer name as a parameter but defaults to the local host. It creates an HTML report with the 3 WMI classes.

C:\>c:\scripts\wmicreport.bat quark
Creating report for quark
See quark-report.html

Overview

In some respects, using WMIC to create these types of reports is even easier than using PowerShell. The bottom line is, don’t think you need scripting or even PowerShell to work with WMI. This command line tool might appear a bit daunting at first, but with patience and some trial and error you’ll quickly discover many ways to use it.

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