PowerShell@HungYuWu

• What is Cmdlet?






• a command-ine tool






• PS C:\> get-process



• Focus on a particular tast






• PS C:\> Get-Command -Noun service






• Get-Service,New-Service,Restart-Service.......



• Consistent






• Verb-Noun



• Cmdlet -param1 <value> -param2 <value>



• Get-help cmdletname
  Get-Service | Sort-object Name
  Get-Service | Group-object Name



• Object => Cmdlet => Object    //以物件輸入及輸出






• No more prayer-based parsing



• Objects aren't static



• Objects have methods and calling those to do stuff



• Retrieve object of interest






• get-eventlog system



• Flow cintrol anf filtering






• where-object {$_.... }



• Infrastructure






• get-alias



• Useful info






• Available command?






• List all command






• PS C:\> get-command



• How many?






• PS C:\> get-command | measure-object
  Count : 129
  Average :
  Sum :
  Maximum :
  Minimum :
  Property :



• What parameters does a cmdlet take?






• different input  => take different action






• get-eventlog -logname system



• get-eventlog -list



• (get-command get-eventlog).definition






• Get-EventLog [-LogName] <String> [-Newest <Int32>] [-Verbose] [-Debug] [-ErrorA
  ction <ActionPreference>] [-ErrorVariable <String>] [-OutVariable <String>] [-O
  utBuffer <Int32>]



• Get-EventLog [-List] [-AsString] [-Verbose] [-Debug] [-ErrorAction <ActionPrefe
  rence>] [-ErrorVariable <String>] [-OutVariable <String>] [-OutBuffer <Int32>]



• What object does a Cmdlet output?






• get-eventlog -logname system | get-member
  TypeName: System.Diagnostics.EventLogEntry



• Categories of cmdlets






• Retrieve object



• Take action



• Filter and control flow



• Output and format



• Work with windows PowerShell providers



• Windows Powershell(including reflection)



• Cmdlet walkthrough!






• Retrieve object






• set of thing | what you want to do...






• get-process => pipeline => next cmdlet



• get-process, get-eventlog, get-service



• Get-WMIObject






• $BIOS = Get-WMIObject win32_bios
  $BIOS | get-member



• Get-WMIObject win32_bios | format-list *             // list all property



• Get-WMIObject win32_bios | format-list [a-z]*      //regular expression



• Get-WMIObject win32_bios -computername JOSEPHPC  //Remote computer



• (get-command Get-WMIObject).definition



• Get-WMIObject -list | where-object {$_.Name -match "^Win32.*"}  //browsing the repository for win_32 classes



• New-Object






• $object = new-object -comobject "shell.Applicaiton"
  $object | get-member   //see the property , method ...



• $object.cascadewindows()    //改變多視窗顯示模式



• 使用.net






• $DI = new-object System.IO.DirectoryInfo($PSHOME)   
  $DI.CreationTime






• 2006年11月1日 下午 07:39:29



• Get-Eventlog






• get-eventlog -logname application -newest 5   //取最新的5筆log



• Take action






• get-service alerter, start-service alerter, stop-service alerter....



• Filter and control flow






• do this to provide concsistency



• some of this functionality is provided intrinsically by PowerShell






• Where-Object      //like SQL 過濾條件






• get-service | measure-object
  //script block,pipe obj one by one



• get-service | where-object {$true} | measure-object



• $_ : like object variable; each value object






• get-process | where-object {$_.workingset -ge 10000000}



• Comparision Operators



• get-process | where-object {$_.ProcessName -match 'p.*shell' }



• ForEach-Object






• 30000,56798,12432 | forEach-Object -process {$_/1024}  //每個數字除以1024






• 29.296875
  55.466796875
  12.140625



• Select-Object   //選擇欄位






• get-wmiobject win32_processor | select-Object  Maxclockspeed



• Tee-Object






• Tee as in T



• Y-Object might have been a better name



• grabs a snapshot of objects working their way down the pipeline



• stores snapshot in file or varialbe



• $proc = get-process notepad  //儲存回傳物件於變數
  $proc                                      //顯示物件



• get-process notepad | tee-object -variable proc   //儲存回傳物件於變數並且顯示於螢幕上



• get-process notepad > noteout.txt   //儲存回傳物件於檔案



• get-process notepad | tee-object -file noteout.txt //儲存回傳物件於檔案並且顯示於螢幕上



• Output and format






• Take the work out of creating basic spreadsheets and HTML pages



• Override default formattting






• group-object






• get-eventlog application | group-object eventid  //欄位為count, eventid,group



• get-process | group-object company    



• sort-object






• get-eventlog application | group-object eventid -descending | sort-object count



• convertion-html






• get-service | convertion-html | out-file "service.htm"
  invoke-item service.htm



• export-csv






• get-service | export-csv -notypeinformation service.csv
  invoke-item service.csv



• Work with windows PowerShell providers






• set-location HKCU 
  get-childitem



• set-location "control panel"
  get-childitem



• Windows Powershell(including reflection)






• mamage aspects of PowerShell Environment



• include reflection



• Get-History //查看本session曾打過的指令



• Get-Alias



• four windows powershell cowfolk






• get-command



• get-help -full <cmd-name>



• get-psdrive



• get-psprovider

Cmdlets are not created equal