Vista - error handling

Hi again!

How do i handle with errors in PS?

Here are NT Shell examples for what i need:

net user %username% /domain || echo %username% does not exit! >> error.txt

or

net user %username% /domain 1>nul: 2>error.txt

-------

What are the equivalents in Powershell? How can i log my own information
about a command that doesnt execute because of an error like a not existing
object?

I need the PS solutions for '||' '&&' '2>' ...... if %errorlevel%==


I think you will get a lot of more such questions the next days from me ;-)

Thanks and Greets!
MaxMad

I have a series on my site about this
http://bsonposh.com/modules/wordpress/?p=51

"MaxMad" <MaxMad@xxxxxx> wrote in message
newsEEAD103-3F6B-4FE5-8ABA-8BB444671BF9@xxxxxx

"MaxMad" <MaxMad@xxxxxx> wrote in message
newsEEAD103-3F6B-4FE5-8ABA-8BB444671BF9@xxxxxx$? indicates whether or not the last command succeeded or failed which in
the case of a console exe means 0 or non-zero for failure.

net user $username /domain
if (!$?) { "$username does not exists" >> error.txt }
net use $username /domain 2>error.txt > $null
&& just changes the "if (!$?) { ... }" to "if ($?} { ... }". $LastExitCode
holds the last exit code returned by a call to an EXE.

BTW I do this a lot so I have created a CheckLastExitCode function that
looks like this (and uses another function called Get-CallStack):

function Get-CallStack {
trap { continue }
1..100 | foreach {
$var = Get-Variable -scope $_ MyInvocation
$var.Value.PositionMessage -replace "`n"
}
}

function CheckLastExitCode {
param ([int[]]$SuccessCodes = @(0), [scriptblock]$CleanupScript=$null)

if ($SuccessCodes -notcontains $LastExitCode) {
if ($CleanupScript) {
"Executing cleanup script: $CleanupScript"
&$CleanupScript
}
$OFS = $NL = [System.Environment]::NewLine
throw "EXE RETURNED EXIT CODE ${LastExitCode}${NL}$(Get-CallStack)"
}
}

Some EXEs have multiple success codes or they don't use 0 as a success code
so you can pass in an array of success codes to this function but it does
default to 0 as the one success code.

--
Keith

thanks :-) Thats what i was looking for!

Greets MaxMad

"Keith Hill [MVP]" wrote: