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Adding logic and loops
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The only difference is where I put the opening curly brace. PowerShell doesn t care, but this method does make it a bit easier to quickly distinguish the commands inside the construct, and to make sure that you ve properly closed the construct. I tend to use the first formatting style because it takes up less room on-screen in a class, and it takes up fewer lines in a book like this. I find that administrators who are neat and consistent about formatting their constructs typically have to spend less time debugging their scripts, so there s another benefit of properly indenting the commands and so forth. Sometimes, you may need to check multiple potential conditions. An ElseIf allows you to do so:
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If ($service.name -eq 'BITS') { Write-Host 'This is the transfer service' } elseif ($service.name -eq 'Spooler') { Write-Host 'This is the print spooler' } elseif ($service.name -eq 'W32Time') { Write-Host 'This is the time service' }
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You can have as many ElseIf sections as you want, and each one gets its own conditional expression in parentheses. PowerShell will review these in order, and it will execute only the first one whose expression evaluates to True. Once it finds one, it won t evaluate or consider any of the remaining options. The last permutation of this construct is to add a kind of catch-all that will execute if no preceding condition has been True:
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If ($service.name -eq 'BITS') { Write-Host 'This is the transfer service' } elseif ($service.name -eq 'Spooler') { Write-Host 'This is the print spooler' } elseif ($service.name -eq 'W32Time') { Write-Host 'This is the time service' } else { Write-Host 'This is an unknown service' }
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The Else block comes last, and it will execute only if none of the preceding If or ElseIf expressions evaluated to True. You can use Else even if you aren t using any ElseIf blocks. The parenthetical expressions used with If and ElseIf will often contain a comparison operator, because comparisons are usually an easy way to get a True or False result. But that isn t always the case. If you have a property or variable that already contains $True or $False, you don t need a comparison at all. For example, consider this snippet:
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$processes = Get-Process if ($processes[0].responding -eq $True) { Write-Host 'The first process is responding' }
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The Switch construct
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The Responding property of a process always contains either $True or $False, so there s no need to actually compare it to $True or $False. You could rewrite this as follows:
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$processes = Get-Process if ($processes[0].responding) { Write-Host 'The first process is responding' }
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This is a much more common way of handling the situation. Remember, all you care about is that the interior of the parentheses boils down to $True or $False in some fashion. In this case, because the Responding property already provides one of those two values, you don t need to do any more work. Here s a quick tip: I learned about the Responding property by running GetProcess | Gm. In the list, I saw Responding and wondered what kind of information it contained. Would it be a 0 or 1 A Yes or No Something else So I ran Get-Process | Format-List *, which displayed all of the processes properties and their values. That output showed me that Responding contained True for almost all of my processes, so I logically assumed that False was also a possibility. I encourage you to use this same technique to discover what s inside the properties of other objects you work with.
20.4 The Switch construct
The Switch construct acts as a specialized kind of logical comparison. You start with a single variable or property, and you ask the shell to compare its contents to a wide range of possible values. The shell will execute a block of commands for each match that it finds. Here s an example that translates a numeric printer status code into a humanreadable status message:
Switch ($printer.status) { 1075 { Write-Host 'Printer jammed.' } 1842 { Write-Host 'Toner needed.' } 1167 { Write-Host 'Overheating.' } 4422 { Write-Host 'Out of paper.' } 'OK' { Write-Host 'Operating normally.' } Default { Write-Host 'Status unknown.' } }
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