Powershell: errorhandling in script

Question

I have a script which are going to run on several local computers, but I haven't done any errorhandling in it. I have not done any errorhandling in powershell at all, so i'm a total noob here. I read something about it, but honestly I am just looking for an quick and easy answer..

Q: Is there something like a try/catch, as little code as possible to not make the script heavy weight?

nimizen · Accepted Answer · 2012-04-17 14:51:49Z

2

Yes, try/catch/finally is available in Powershell v2:

Try{
<main code here>
}
Catch{
write-host $_ #Using the reserved $_ variable which should contain the error string
}
Finally{
<clean up code here - will execute regardless>
}

If you're constrained to use Powershell v1 then you will have to use the trap construct.

answered Apr 17, 2012 at 14:51

nimizen

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3 Comments

haakonlu Over a year ago

I'm using powershell v2. What I did with this code was paste all my script into the Try{}, and leave the catch unspecified so that it would catch all exceptions,(I thought), when I on purpose wrote a new line in the try{} "sdgsf" I got the error message specified in the catch{}, but when I do something like: "$username = gc env:usernamejghc" (I wrote jiberish at the end of the command) I get error: Get-Content : Cannot find path 'Env:\usernamejghc' because it does not exist. I'm going to read some more on the subject, meanwhile: Any suggestions that will handle this error?

David Brabant Over a year ago

You mean $env:usernamejghc, I guess. The message exactly tells you what happens.

haakonlu Over a year ago

Yes, but why won't the catch block "catch" it? If this error escape it, I suppose other can too?

Nick Martin · Accepted Answer · 2012-04-17 14:53:36Z

0

Powershell 2.0 has try, catch and finally. See http://technet.microsoft.com/en-us/library/dd315350.aspx You can also do a more command-line oriented variation of error handling with error trapping like here: http://www.informit.com/articles/article.aspx?p=729515&seqNum=5

answered Apr 17, 2012 at 14:53

Nick Martin

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