I have a Powershell deploy script that runs multiple background tasks in parallel using a script block. The block was using Write-Host but I wasn’t getting any output. Turns out I needed to use Receive-Job to capture any output.
# helper to log results\nfunction _handleJobResults {\n Write-Host \"listing all jobs\"\n Get-Job\n\n Write-Host \"resetting jobs\"\n Get-Job | Remove-Job\n}\n\nfunction _waitForJobs {\n # should really check that jobs have finished, maybe in another post.\n Write-Host \"waiting for jobs to finish\"\n Start-Sleep -Seconds 2\n}\n\n$jobCount = 3\n\n# function block to be invoked in background job.\n$_deployBlock01 = {\n param($_i)\n Write-Host \"script block output: $_i\"\n}\n\n# invoke background jobs\n# no Write-Host output from $_deployBlock01\nforeach ($i in 1..$jobCount) {\n Start-Job -ScriptBlock $_deployBlock01 -Name \"test-job-$i\" -ArgumentList $i\n}\n\n_waitForJobs\n_handleJobResults\nWrite-Host \"no output from script block should have been logged.\"\n\nWrite-Host \"re-run jobs, capture output\"\n# invoke background jobs, capture outputs\nforeach ($i in 1..$jobCount) {\n Start-Job -ScriptBlock $_deployBlock01 -Name \"test-job-$i\" -ArgumentList $i\n}\n\n_waitForJobs\n\nWrite-Host \"Get Job output\"\n#Recieve-Job will get the Write-Host output.\nGet-Job | Receive-Job\n\n_handleJobResults