Excellent Dave--thanks.


On Aug 15, 2005, at 4:45 AM, David T. Lewis wrote:

> On Sun, Aug 14, 2005 at 10:19:07PM -0600, Brian Murphy-Dye wrote:
>
>> So how would one get the results of:  'ls -l | grep -i Squeak'?
>> CommandShell command: 'ls | grep -i Squeak'   brings up a new window
>> rather than returning the results of the command as a string :o[
>>
>> Brian.
>>
>>
>
> Use the instance side methods to avoid opening the CommandShell
> window. Try inspecting this:
>
>     | pipeline |
>     pipeline := CommandShell new pipeline: 'ls -l | grep -i Squeak'.
>     (Delay forMilliseconds: 20) wait. "oops, this should not be  
> necessary"
>     pipeline last upToEnd
>
> But it looks like there is a timing glitch that I need to iron out.
> The expression:
>
>     (CommandShell new command: 'ls -l | grep -i Squeak') upToEnd
>
> is supposed to produce the output you expect. I think this is a bug
> in CommandShell, presumably in the way I'm handling the closing of  
> pipes
> in a pipeline of external processes. It seems to show up in post-3.6
> Squeak images, but I think it's a bug in my pipeline handling.
>
> In any case, if you create the command pipeline as shown above, and
> wait a few milliseconds before reading the output pipe, you will get
> the result you're looking for.
>
> If you are interested in doing command scripts using external commands
> mixed with Squeak, have a look at the methods in "command scripting"
> in class CommandShell. I've used these for things like building Squeak
> plugins and restarting Squeak only if the external commands succeed.
>
> You can use these with or without the shell window being open. It's
> nice to open the window if you are building a VM, but you can leave
> it closed if you just want to run a command script silently.
>
> Dave
>
>
>
>> On Aug 14, 2005, at 12:00 PM, David T. Lewis wrote:
>>
>>
>>> On Sun, Aug 14, 2005 at 06:06:44PM +0200, stephane ducasse wrote:
>>>
>>>
>>>>>
>>>>>
>>>>> Yes, but from the limited time I spent looking into it, it not so
>>>>> easy to execute  a program from squeak though. I got as far as
>>>>> loading the OSProcessPlugin before talk of using VMMaker got me
>>>>> thoroughly confused. Is there a simple guide on how to execute a
>>>>> shell command from Squeak that does not require me to compile a  
>>>>> VM?
>>>>>
>>>>> Daniel
>>>>>
>>>>>
>>>
>>> If you are using a Unix VM (one of the pre-compiled VMs from Ian's
>>> site),
>>> then the plugins (OSProcessPlugin and XDisplayControlPlugin) are
>>> already
>>> included. You don't have to build anything. Just load the OSProcess
>>> and
>>> CommandShell packages from Squeak Map and everything should work  
>>> fine.
>>>
>>> Dave
>>>
>
>
>