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Technically, the jobs that I ll discuss in this chapter are just one kind of jobs that you can encounter. Jobs are an extension point for PowerShell, meaning that it s possible for someone (either in Microsoft or as a third party) to create other things called jobs that look and work a bit differently than what I ll describe here. I just wanted you to know that little detail, and to know that what you ll learn here only applies to the native jobs that ship with PowerShell v2.
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12.3 Creating a local job
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The first type of job we ll cover is perhaps the easiest: a local job. This is a command that runs more or less entirely on your local computer (with exceptions that I ll cover in a second) and that runs in the background. To launch one of these jobs, you use the Start-Job command. A -scriptblock parameter lets you specify the command (or commands) to run. PowerShell will make up a default job name (Job1, Job2, and so on), or you can specify a custom job name by using the -Name parameter. If you need the job to run under alternative credentials,
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Multitasking with background jobs
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a -credential parameter will accept a DOMAIN\Username credential and prompt you for the password. Rather than specifying a script block, you can specify the -FilePath parameter to have the job execute an entire script file full of commands. Here s a simple example:
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PS C:\> start-job -scriptblock { dir } Id -1 Name ---Job1 State ----Running HasMoreData ----------True Location -------localhost
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The result of the command is the job object that was created, and you can see that the job immediately begins running. The job is also assigned a sequential job ID number, which is shown in the table. I said that these jobs run entirely on your local computer, and that s basically true. But the commands in the job are allowed to access remote computers, which would be the case if you ran a command that supported a -computerName parameter. Here s an example:
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PS C:\> start-job -scriptblock { get-eventlog security -computer server-r2 } Id -3 Name ---Job3 State ----Running HasMoreData ----------True Location -------localhost
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TRY IT NOW Hopefully you ll follow along and run all of these commands. If
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you only have a single computer to work with, refer to its computer name and use localhost as an alternative, so that PowerShell will act like it s dealing with two computers. The processing for this job will happen on your local computer. It will contact the specified remote computer (SERVER-R2 in this example), so the job is, in a way, a remote job. But because the command itself is running locally, I still refer to this as a local job. Sharp-eyed readers will note that the first job I created was named Job1 and given the ID 1, but the second job was Job3 with ID 3. It turns out that every job has at least one child job, and the first child job (a child of Job1) was given the name Job2 and the ID 2. We ll get to child jobs a bit later in this chapter. Here s something to keep in mind: although local jobs run entirely locally, they do require the infrastructure of PowerShell s remoting system, which we covered in chapter 10. If you haven t enabled remoting, you won t be able to start local jobs.
12.4 WMI, as a job
Another way to start a job is to use Get-WmiObject. As I explained in the previous chapter, that command can contact one or more remote computers, but it does so sequentially. That means a long list of computer names can cause the command to
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take a long time to process, and it s a natural choice for moving to a background job. To do so, you use Get-WmiObject as normal but add the -AsJob parameter. You don t get to specify a custom job name here; you re stuck with the default job name that PowerShell makes up.
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