Powershell Megathread: Verb-Noun Scripting is the future

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Powershell Megathread: Verb-Noun Scripting is the future

Victor: Jun 18, 2004

adaz, thanks for all the example scripts; may I steal them? Also, I would suggest adding Windows Powershell in Action &mdash it's a pretty good book written by someone from the inside.

I've written several PowerShell articles; here are a few that are probably more interesting:

brief syntax overview

code snippets, such as:

code:

# nicer syntax for lists
> function list() { $args }
> list a b c
a
b
c
> (list a b c).GetType().Name
Object[]

regular expressions (some of you know how much I love them)
error handling (PowerShell uses a strange mix of return code and exception handling)
abysmal pipeline performance (don't expect grep | sed style operations to be fast with thousands of lines of text)
some good blogs

I kind of dove in intensely, got familiarized, wrote a bunch of articles (some of which are still very raw), and then moved on to other things.

# ¿ Apr 17, 2010 05:53

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# ¿ Apr 28, 2024 07:48

Victor: Jun 18, 2004

You should know about Powershell Pipeline Performance. Other than that, Powershell's string escaping mechanism is not weird, and echo is no longer special.

# ¿ May 20, 2010 00:45

Victor: Jun 18, 2004

Yes you can; you can use the System.Diagnostics.Proccess class, and/or P/Invoke. Do you need the Win32 APIs for doing what you want to do? (I would first check out the Process class to see how much you can do with that.)

# ¿ May 24, 2010 23:17

Victor: Jun 18, 2004

Someone earlier in this thread said you have to Format-Table nothing or everything, but not half-and-half.

# ¿ Oct 14, 2010 20:08

Victor: Jun 18, 2004

Walked: Tee-Object

Victor fucked around with this message at 00:14 on Oct 19, 2010

# ¿ Oct 19, 2010 00:12

Victor: Jun 18, 2004

Walked, you might look for PowerShell equivalents for runas, or just use runas. (run as)

# ¿ Oct 22, 2010 21:46

Victor: Jun 18, 2004

Ryouga Inverse, try this:

code:

(Get-Content input.prf) -replace "LOGIN", "BBQ" | Set-Content -Path new.prf

I'm not sure why there is no PoSH version of sed — the GnuWin32 version switches your documents to Unix-style \n line endings.

Your > new.prf may have caused a bunch of NULLs because it was trying to output Unicode; read up on $OutputEncoding.

# ¿ Oct 27, 2010 06:31

Victor: Jun 18, 2004

Get-ChildItem -Recurse | ? { $_ -is [System.IO.DirectoryInfo] }

# ¿ Nov 1, 2010 09:41

Victor: Jun 18, 2004

This should do ya:

code:

Get-ChildItem                              | 
    ? { $_ -is [System.IO.DirectoryInfo] } | 
    % { Get-ChildItem $_ }                 | 
    ? { $_ -is [System.IO.DirectoryInfo] }

(To those better at PowerShell, I'd love to know if there are better ways to do the above.)

# ¿ Nov 1, 2010 11:05

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# ¿ Apr 28, 2024 07:48

Victor: Jun 18, 2004

marketingman posted:

Mate you are a lifesaver, that's done the trick nicely. If you have some time, would you mind explaining what each piece is doing, it seems like something I should have been able to quickly get my head around but for some reason haven't.

code:

Get-ChildItem                              | # get all items in the current directory
    ? { $_ -is [System.IO.DirectoryInfo] } | # filter to the ones that are directories
    % { Get-ChildItem $_ }                 | # get all items under each of those directories
    ? { $_ -is [System.IO.DirectoryInfo] }   # again, filter to all the items that are directories

Remember:
? is the same as Where-Object
% is the same as Foreach-Object

# ¿ Nov 1, 2010 19:00

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Powershell Megathread: Verb-Noun Scripting is the future