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0205 | Objects for the Admin

  • resource link
    • powershell.org
  • recommended book chapter
    • Don Jones | "Learn Winows Powershell in a month of lunches" | chapter 9
  • book
    • "Learn PowerShell in a Month of Lunches, Fourth Edition"

Get the objects properties and methods​

get-member
gm

Object | simple definition​

  • an object has things it has --> properties
  • there are things it can do --> methods

Example | Processes with handles above x and sort by handles​

Get-Process | where handles -gt 1000 | sort handles

Example | Display the folder content and sort by size​

get-childitem | select -property name, length | sort -property lenght -descending

Example | Select specific properties when displaying the event logs​

get-eventlog -logname system -newest 5 | select -property eventid, timewritten, message | sort -property timewritten | convertto-html | out-file c:\errorlog.html

Example | Casting a file and operating on it​

# read in
$x = [xml](cat .\r_and_j.xml)
# display version
$x
# get the type
$x.gettype()
# get play.act.
$x.play.act[0].scene[0].speech
# group and sort
$x.play.act.scene.speech | group speaker | sort count

Filtering with where​

  • 2 usages
    • with script and with strings
  • simple version 
    gps | where handles -ge 1000

where | Script version | Basic algorithm​

  • #1 | Take each object coming through the pipeline and assign it to a variable ($PSItem or $_)
  • #2 | Evaluate the code between {}
  • #3 | If the code returns true --> pass the object through; if not --> discard the object
  • example 
    get-service | where {$_.status -eq "Running"}
    # is the same as
    get-service | where {$PSItem.status -eq "Running"}
    # extended
    get-service | where {$PSItem.status -eq "Running" -and $_.name -like "b*"}

List the available operators​

get-help *operators*