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0203 | The pipeline | Getting Connected

Intro into the pipeline​

  • simple idea: take some object, send it through the pipeline (not just the string representaiton of it)
  • pipe character: |
  • example 
    get-service | select-object name, status | sort-object name
    # is the same as
    get-service |
    select-object name, status |
    sort-object name

Current object crossing the pipeline​

  • either $_. or $PSItem.

Example | Services​

# stop a specific service
get-service -name bits | stop-service
# rerun the service -- display the results
get-service -name bits | start-service -passthru
# export the services to a csv file
get-service | export-csv -Path c:\service.csv
# and import it back
import-csv c:\service.csv

Example | Debugging Processes​

# take a snapshot of the running processes - on tha baseline machine
get-process | export-clixmd -path c:\good.xml
# compare it to the machine you are debugging
Compare-Object -ReferenceObject (Import-Clixml 'C:\good.xml') -DifferenceObject (Get-Process) -Property name

Converto vs Export​

  • export is converto and out

Example | Exporting services in an HTML format​

get-service | convertto-html -property name, status | out-file c:\test.html
# check it
c:\test.html

If Unsure​

  • "When in trouble, fear or doubt, run in circles, scream and shout" :D
  • show exactly what it would do
  • if unsure, use -whatif
  • example 
    get-service | stop-service -whatif

Confirm (whatif with confirm)​

  • show what it would do and ask if you want to do it
  • example 
    get-service | stop-service -confirm
    # or to stop one right away and save time 
    get-service -displayname *bi* | stop-service -confirm