Vista - HowTo: Remove a .Dot Source Script from current environment?

Can you do this? How? (and I dont mean restart psh )

There's no direct way to do that. It's possible to approximate _somewhat_
with crude techniques such as reloading the config script, but in general
this is a bit like trying to un-scramble an egg: not a good idea. You're
better off throwing it away if you need to do more than remove a shell
fragment.


"Brandon Shell" <tshell.mask@gmail.com> wrote in message
news:%23cee2M01GHA.3656@TK2MSFTNGP04.phx.gbl...
> Can you do this? How? (and I dont mean restart psh )
>

When you define variables, aliases, and functions, they get populated by
default in the local scope. If you dot-source from a script, they go away
when the script exits. If you dot-source from the regular command line,
they go away when PowerShell exits.

If you want to contain these changes so that you can still revert them from
the command line, you need to ensure that the "Local Scope" is not the scope
for the entire shell. So, you define them in a new scope. Jeffrey's blog
on topic that includes the Start-NewScope function is helpful for that:

http://blogs.msdn.com/powershell/arc...25/583268.aspx

--
Lee Holmes [MSFT]
Windows PowerShell Development
Microsoft Corporation
This posting is provided "AS IS" with no warranties, and confers no rights.


"Alex K. Angelopoulos [MVP]" <aka@online.mvps.org> wrote in message
news:O2aM8X01GHA.3464@TK2MSFTNGP03.phx.gbl...
> There's no direct way to do that. It's possible to approximate _somewhat_
> with crude techniques such as reloading the config script, but in general
> this is a bit like trying to un-scramble an egg: not a good idea. You're
> better off throwing it away if you need to do more than remove a shell
> fragment.
>
>
> "Brandon Shell" <tshell.mask@gmail.com> wrote in message
> news:%23cee2M01GHA.3656@TK2MSFTNGP04.phx.gbl...
>> Can you do this? How? (and I dont mean restart psh )
>>
>
>

We don't have an automatic way of doing this, however, you could easily
create a function that removes all traces of the bits the script created.
This is not a good solution, I know, but it is possible. I hope that
someday we'll have a good answer here.

# swallow-tail.ps1
# after ouroborus
$CurrentModule = "utilityfunctions"
function get-Function1
{
"I'm function 1!"
}

function get-Function2
{
"I'm function 2!"
}
function remove-utilityFunctions
{
rm variable:CurrentModule
rm function:Get-Function1
rm function:Get-Function2
rm function:remove-utilityFunctions
}

PS> . swallow-tail
PS> get-function1
I'm function 1!
PS> get-function2
I'm function 2!
PS> $currentmodule
utilityfunctions
PS> remove-utilityFunctions
PS> remove-utilityFunctions
The term 'remove-utilityFunctions' is not recognized as a cmdlet, function,
operable program, or script file. Verify
ry again.
At line:1 char:23
+ remove-utilityFunctions <<<<
PS> $currentmodule



--
--
James Truher [MSFT]
Windows PowerShell Development
Microsoft Corporation
This posting is provided "AS IS" with no warranties, and confers no rights.

"Brandon Shell" <tshell.mask@gmail.com> wrote in message
news:%23cee2M01GHA.3656@TK2MSFTNGP04.phx.gbl...
> Can you do this? How? (and I dont mean restart psh )
>