Use the PowerShell Grep Command to Parse the Command Line

re: Use the PowerShell Grep Command to Parse the Command Line

saal.it — Tue, 19 Feb 2013 13:07:10 GMT

@DJS

Is Filter table a solution?

Get-WmiObject -Class Win32_DiskDrive |ft Caption

Caption

-------

HITACHI HTS723232A7A364 ATA Device

Ricoh SD Disk Device

Kingston DataTraveler 150 USB Device

re: Use the PowerShell Grep Command to Parse the Command Line

DJS — Thu, 07 Feb 2013 22:34:21 GMT

This seems to work well when you're selecting strings from non-PowerShell commands. But when you are, it's not quite the same.

Consider this. I'm trying to use the Get-WmiObject cmdlet to search Win32_DiskDrive and pluck out only the line that says Caption. I just want to be able to see what drive a machine may have. (Mostly I'm playing around.) What I *want* to do is Get-WmiObject -Class Win32_DiskDrive | grep "Caption". That would give me what I'm looking for. But here I'm trying to do it in PowerShell, so in accordance with your suggestions here, I've tried things like:

Get-WmiObject -Class Win32_DiskDrive | Select-String -Pattern "Caption" -SimpleMatch.

This doesn't work. I get nothing as a response - just another prompt. My guess is that what is being returned is technically not a string at all, but the actual object, so there's really nothing to display. But I don't know how to get what I want.

re: Use the PowerShell Grep Command to Parse the Command Line

Ed Wilson — Sun, 07 Aug 2011 21:24:06 GMT

@BigTeddy you are right ... on some machines. On my laptop, I get an error about indexing into a match collections ... but the prolbem is that IPV4 only appears ONCE in my output. If I do this: (ipconfig /all | Select-String "dhcp")[0] it works and allows me to index into the collection ...

re: Use the PowerShell Grep Command to Parse the Command Line

Bigteddy — Fri, 05 Aug 2011 19:53:15 GMT

Or this:

(ipconfig | Select-String "IPv4")[0]

re: Use the PowerShell Grep Command to Parse the Command Line

Ed Wilson — Mon, 01 Aug 2011 16:35:17 GMT

@jrv I have not written about the Script Control, and I do not believe that Sean has either. It is a great subject for an article, or two. I do have a small article, in the Library that talks about using the Script Control. It is a good suggestion ... Look for something in the next month or so.

re: Use the PowerShell Grep Command to Parse the Command Line

jrv — Mon, 01 Aug 2011 15:35:09 GMT

Thanks Ed. I am enjoying how far you and Sen have gotten with scavenging all useful thngs from legacy commands and scripts.

Yes. PowerShell has so many ways to do everything.

Do you have any articles on the Script Control?

re: Use the PowerShell Grep Command to Parse the Command Line

Ed Wilson — Mon, 01 Aug 2011 13:55:38 GMT

@JRV Thank you. I am glad you liked the article. Your suggestion is a good one. That is one thing I LOVE about PowerShell is that there are dozens of ways of doing the same thing. I LOVE your alternative solutions ...

re: Use the PowerShell Grep Command to Parse the Command Line

jrv — Mon, 01 Aug 2011 10:45:45 GMT

Good artcle once again..

Try this

(ipconfig) -match 'ipv4'