Power and Pith

re: Power and Pith

Borat — Sun, 22 Oct 2006 17:41:38 GMT

I like!

re: Power and Pith

Julian Kay — Mon, 23 Oct 2006 18:26:31 GMT

I like it! Thank you!

re: Power and Pith

Stefan — Mon, 23 Oct 2006 21:43:57 GMT

Why don't you use "gci c:\ | select-object fullname" ?

re: Power and Pith

jachymko — Wed, 25 Oct 2006 16:55:15 GMT

Stefan, you don't want to use select-object because it returns a collection of PSCustomObjects, each one with a FullName property.

This function returns only the actual values of the property (eg. strings, ints, not wrapped in a PSCustomObject)

re: Power and Pith

Andrew — Thu, 26 Oct 2006 21:43:44 GMT

I tried your suggestion, i.e., ${function:...} and I get errors. What is wrong? This is RC2 of the powershell running in XPSP2. See below...

Windows PowerShell

PS U:\> ${function:...} = { process { $_.($args[0]) } }

PS U:\> gci c:\ | _ FullName

The term '_' is not recognized as a cmdlet, function, operable program, or script file. Verify the term and try again.

At line:1 char:12

+ gci c:\ | _ <<<< FullName

PS U:\> gci c:\ | _FullName

The term '_FullName' is not recognized as a cmdlet, function, operable program, or script file. Verify the term and try

again.

At line:1 char:19

+ gci c:\ | _FullName <<<<

PS U:\> gci c:\ | FullName

The term 'FullName' is not recognized as a cmdlet, function, operable program, or script file. Verify the term and try

again.

At line:1 char:18

+ gci c:\ | FullName <<<<

re: Power and Pith

David — Fri, 27 Oct 2006 11:38:52 GMT

Andrew: try using a real name for the function (replace "..." with something useful :)

re: Power and Pith

Marcel — Fri, 27 Oct 2006 22:56:25 GMT

I like to use the name pick, however, "..." works just fine. The problem Andrew is having isn't because he's using "..." as the name. The problem is he's creating a function called "..." but in his tests he's using "_" instead.

re: Power and Pith

Jamie — Sat, 28 Oct 2006 01:33:08 GMT

I had two questions about this function:

1. What are the rules for non-alphanumeric function names? I tried creating a function !! to give me the last command line (like csh), but I can't seem to overload the !.

2. In the function body is the command 'process', which appears to be shorthand (not an alias) for get-process. I see the same functionality for the noun 'item', but not for 'object'. What are these and how do the work?

Pretty cool stuff!

re: Power and Pith

John — Sat, 28 Oct 2006 17:49:31 GMT

Jamie,

!! seems to have some special meaning, though I'm not sure what it is. $$ is the variable for getting the last command that was run, though.

As for the process {} bit, this mimics the Process() method in a cmdlet. What that means is that whatever's passed along the pipeline will get passed to the process part of the function. begin {} and end {} are called before the first item is processed, and after the last item respectively.

re: Power and Pith

PowerShellTeam — Sat, 28 Oct 2006 19:06:21 GMT

! is a synonym for the -not operator:

PS (1) > ! $true

False

PS (2) > !! $true

True

PS (3) > -not $true

False

PS (4) > -not -not $true

True

You can define a function called !!

PS (5) > function !! { "Hi" }

but you have to use the call operator '&' to call it:

PS (6) > & !!

-bruce

=========================================================

Bruce Payette

Windows PowerShell Technical Lead

re: Power and Pith

John — Sat, 28 Oct 2006 19:23:54 GMT

Hi Bruce,

I thought it'd be something like that but a quick scan of about_operator didn't reveal it. I just checked about_logical_operator, and it's mentioned there. It's nice that the ! operator is kept from C#, though I note that && and || aren't kept (for rather obvious reasons, I'd guess).

(Eagerly awaiting your book, by the way! I'd have signed up for early access, but I already ordered it from Amazon.co.uk, and I like having the physical book)

Thanks

John

re: Power and Pith

MikeL — Fri, 29 Dec 2006 23:17:51 GMT

I just started with PowerShell.

Wanted to run some test scripts from you download.

When I tpye in Beep.ps1 I get "The term 'Beep.1' is not recognized....."

What Am I doing wrong?

re: Power and Pith

PowerShellTeam — Sat, 30 Dec 2006 01:19:26 GMT

> When I tpye in Beep.ps1 I get "The term 'Beep.1' is not recognized....."

> What Am I doing wrong?

You are relying upon a traditional bad shell behaviour that has been a security nightmere for decades.

In PowerShell, you have to be explicit if you want to run a command in the current directory. Type ".\beep.ps1"

Jeffrey Snover [MSFT]

Windows PowerShell/MMC Architect

Visit the Windows PowerShell Team blog at: http://blogs.msdn.com/PowerShell

Visit the Windows PowerShell ScriptCenter at: http://www.microsoft.com/technet/scriptcenter/hubs/msh.mspx

re: Power and Pith

StitchJones — Mon, 12 Mar 2007 18:38:36 GMT

Thank You for supplying the ".\*" information. I have been racking my brain for almost two days wondering what I was doing wrong. And to think it was as simple as using the PROPER .\yourscripthere.ps1 format.

Thank you very very much.