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Try Catch Finally and error handling in PowerShell

Posted on 2014-03-03
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Last Modified: 2014-03-05
Hi,

I have a script and would like to create a handling script that ensures that the script is run successfully.

Any help will be appreciated

introlux
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Question by:introlux
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Expert Comment

by:Qlemo
ID: 39900737
Appropriate error handling cannot be done on an "anonymous" base, because you need to know exactly how to treat which exceptions. So it depends on your code.

There is the (old) trap statement, defining an error handling for the complete scope it is in. So this is for general (last resort) exception handling.

try is applied to the code in its scriptblock only, and so very specific to that.

That's all we can tell about seeing some code.
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Author Comment

by:introlux
ID: 39900950
Here is my code:

$now = [datetime]::now.ToString('ddMMyyyy-HHMM')

Export-Mailbox –Identity "Mailbox1" -PSTFolderPath C:\Folder\mailbox1.$now.pst -Confirm:$false

Export-Mailbox –Identity "Mailbox2" -PSTFolderPath C:\Folder\mailbox2.$now.pst -Confirm:$false

Export-Mailbox –Identity "Mailbox3" -PSTFolderPath C:\Folder\mailbox3.$now.pst -Confirm:$false

Copy-Item -Path c:\Folder\* -Filter *.pst -Destination \\Server\FolderT\ –Recurse

get-childitem c:\Folder | where {$_.CreationTime -lt (date).adddays(-14)} | remove-item -recurse
get-childitem \\Server\Folder\ | where {$_.CreationTime -lt (date).adddays(-14)} | remove-item -recurse

Exit

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LVL 68

Expert Comment

by:Qlemo
ID: 39901853
IMHO there is nothing here you need to encapsulate in try catch blocks here, after you have tested the script to make sure it works in general. If one part fails, the reminder will still work, so the only thing to ascertain should be not to remove the very last copy of each PST. But it is not worth the added effort needed.
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Author Comment

by:introlux
ID: 39901947
What if the copy caused an error? Is there a way to notify that the script was completed successfully? Possibly via email will be usefull
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Accepted Solution

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Qlemo earned 500 total points
ID: 39904094
There are many ways to check for errors. The following uses the $error collection (which contains all errors occured ever) and mails it if something went wrong. (Please take notice that I  have changed the date format to something more useful for sorting.)
$now = get-date -format 'yyyyMMdd-HHmm'

$Error.Clear()

'Mailbox1', 'Mailbox2', 'Mailbox3' | % { 
  Export-Mailbox –Identity $_ -PSTFolderPath C:\Folder\$_.$now.pst -Confirm:$false
}

Copy-Item -Path c:\Folder\* -Filter *.pst -Destination \\Server\FolderT\ –Recurse

get-childitem c:\Folder        | where {$_.CreationTime -lt (date).adddays(-14)} | remove-item
get-childitem \\Server\Folder\ | where {$_.CreationTime -lt (date).adddays(-14)} | remove-item

if ($Error.Count)
{
  Send-MailMessage -SmtpServer mx.Domain.Com -From Me@Domain.Com -To Me@Domain.Com -Subject 'Mailbox copy script failure' -Body ($error -join '`n')
}

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The errors will be in reversed order, because $error[0] always contains the most recently occured error. We could change that to e.g. only use the first error, or dump them in "correct" order, or ...
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Author Closing Comment

by:introlux
ID: 39905930
Thanks!! Spot on!
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