Skip to main content

Useful Powershell stuff

Add a calculated property to a list of objects, along with all the other properties:
    Select *,@{Name="ExtraField;Expression={$_.SomeValue+1}}

Get a list of drives, including network drives and their UNC paths (like with "net use"):
    Get-WmiObject -Class win32_logicaldisk

Get previous session history with "get-history"
Run a previous command without pushing up 1000 times with "invoke-history"

csi = C# interactive (custom alias)

get a list of every property and value for an object:
    $whatever | Format-List
Prevent output from truncating:
    Format-Table -AutoSize -Wrap

& { blah } 1 > $null    - suppress standard output from executing "blah". More info
$var = & Do-Stuff *>&1  - redirect all output to standard output and store that in $var
& { whatever } 2>$null 3>$null - redirect error and warning streams

get-content .\somefile -Wait  - tail-like behaviour, displays additions to the file
get-content | more  - allows paging of output

Getting a count of duplicated things:
$whatever | group FieldToGroup | where Count -gt 1 | sort Count -Descending | select Name, Count

set-clipboard (scb) - sets the contents of the clipboard to whatever is pasted in.  Useful with sls for non-powershell commands that output text that you have to use in another command

`t - tab

When using delimiters with "Import-Csv -Delimiter", make sure not to surround them with quotes

cd env:    gets environment vars
get-psprovider    lists providers
get-psdrive    lists drives
get-module -listavailable    lists all available modules

hashtable of variables for passing in parameters
$parameters = @{
    'param1' = $value1
    'param2' = $value2

Run-SomeCmdlet @parameters     <- notice the @ symbol, not $

write-verbose lines in a function only write if a -verbose flag was provided to the function

@($a) forces $a to be in an array

use regexes with "where" with the "match" operator:
    gci | where name -match '\d{2}'

rename properties for a select:
        ps | select @{Name='Title';Exp={$_.ProcessName}}

select-string (alias: sls)
    very useful for selecting strings from a whole bunch of string-based output
    works like grep in linux
        ipconfig | sls subnet

To use IIS stuff:
    Import-Module WebAdministration
open IIS drive and navigate to a website:
    cd IIS:\
    cd sites\sitename

Get a list of every module
    Get-Module -ListAvailable
Find a module based on name
    Get-Module *web*
Find all commands in a module
    Get-Command -Module WebAdministration

get current item members:
    gi . | gm
recycle an app pool by navigating to it
    cd IIS:\AppPools\somewebsite
    (gi .).Recycle()
or also in one line:
    (gi IIS:\AppPools\somewebsite).Recycle()

ii (invoke-item)
    performs the default action on an item, e.g. opens a file using a program

-join operator, joins strings together
    when used first (unary), joins without delimiting
        -join ("asdf", "qwer") #outputs asdfqwer
    when used as a binary operator, allows a delimiter
        ("asdf", "qwer") -join '-' #outputs asdf-qwer

-replace operator, using regex to replace strings
    replace pairs of html tags with <small>:
        $foo = $foo -replace '<(\/)?\w+>', '<$1small>'

searching application event log for a particular guid:
    Get-EventLog -logname application | where {$_.Message -ilike "*6CD27361-D038-E611-9B7F-005056956605*") } | select message


Popular posts from this blog

Using Log4Net to use both event log and a rolling log file

Here's the config section, note that the applicationNameproperty in the EventLogAppender needs to be the same as the event source in the windows event log that you want to log to.  If the event source doesn't exist, that appender won't work.  In this particular project I create that during install using WiX (which is covered in another post)

    <appendername="RollingLogFileAppender"type="log4net.Appender.RollingFileAppender">      <filevalue="log.txt" />      <datePatternvalue="dd-MM-yyyy" />      <appendToFilevalue="true" />      <locationinfovalue="false" />      <rollingStylevalue="Size" />      <maximumFileSizevalue="1MB" />      <maxSizeRollBackupsvalue="10" />      <staticLogFileNamevalue="true" />      <layouttype="log4net.Layout.PatternLayout">        <conv…

Using WiX to create an event source during install of a .NET framework project

Edit: so I guess I wasn't the only one confused with this stuff, as it's been my most popular post by far!  If I've helped you out or saved you some time, please let me know in the comments :)

In order for this to work, you have to add references to WixUtilExtension and WixNetFxExtension to your WiX project.  Once that's done, add this inside a <Component> element:

<Util:EventSourcexmlns:Util=""Name="EVENTSOURCEGOESHERE"Log="Application"EventMessageFile="[NETFRAMEWORK40FULLINSTALLROOTDIR]EventLogMessages.dll" />
Obviously replace EVENTSOURCEGOESHERE with your event source name.  NETFRAMEWORK40FULLINSTALLROOTDIR is a property set by the WixNetFxExtension which stores the path to the .NET framework v4 directory, but you can replace this with the corresponding property for the directory containing the relevant EventLogMessages.dll file.  So if you're using the .NET framewo…

How to make yourself a Dynamics CRM 2011 Deployment Administrator

Today I needed to deactivate one of our Dynamics organisations, but when I opened the Dynamics Deployment Manager, I received the following error:

"Only the Deployment Administrators are able to use Deployment Manager. You are not a Deployment Administrator."
Bummer. I did a bit of Googling and found this post by Ronald Lemmen (thanks for pointing me in the right direction!).  Since the Dynamics Deployment Manager is obviously checking the MSCRM_CONFIG database for this information I attached a database trace to it and found that it's executing these queries (among many others):

exec sp_executesql N'SELECT  Id, [DefaultOrganizationId], [IsDisabled], [Name]   FROM [SystemUser]   WHERE ((([Name] = @Name0)) ) AND (IsDeleted = 0) ', N'@Name0 nvarchar(41)',@Name0=N'{My windows domain account}'
exec sp_executesql N'SELECT  Id, [Name], [UniqueifierId]   FROM [SecurityRole]   WHERE ((([Name] = @Name0)) ) AND (IsDeleted = 0) ', N'@Name0 nvarchar…