[PD] Can I run scripts with [shell]?

[Alexandros Drymonitis]

Ok, I understand the whole 'context', shell thing. I tried what you guys
suggested in a terminal window and kind of got the picture. But the way
[shell] works remains a mystery to me (even though it's the same way a
teminal window works). I have a few scripts saved in a folder called
'scripts' in the 'Documents' folder in my home directory. In a terminal
window I do the following:

cd Documents/scripts/
sh myscript.sh

and the script runs, no problem. But what the equivalent action with
[shell]? The same steps won't give the same result..


On Tue, Jan 29, 2013 at 1:50 PM, Jack <jack at rybn.org> wrote:

>
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> Le 29/01/2013 11:59, Alexandros Drymonitis a ￩crit :
> > I don't really understand the meaning of 'context' (not the actual word,
> but the way you're using it)..how are these contexts accessible? How are
> commands being executed when sent to the same object?
> >
> >
> > On Tue, Jan 29, 2013 at 12:41 PM, IOhannes m zmoelnig <zmoelnig at iem.at
> <mailto:zmoelnig at iem.at> <zmoelnig at iem.at>> wrote:
> >
> > On 2013-01-29 11:23, Alexandros Drymonitis wrote:
> > > I checked the help patch of [shell], but if I send a cd command
> > > for example, I don't think that something really happens. I
> > > actually would like to run a script from within Pd, but what I
> > > understand is that this can't be really done, is it so? Can anyone
> > > demonstrate something like this?
> >
> > that's exactly the point: with [shell] you _should_ run scripts.
> >
> > each command you send to [shell] will open a new "context".
> >
> > so if you send it a "cd ..", it will create a new context (in your
> > working directory, lets call it ${WD}), move one directory up (so we
> > are now in ${WD}/.., report any output (not very much in this case),
> > and close the context.
> > if you then send it a "pwd", it will create a new context (in your
> > working directory ${WD}), print the PWD and close the context.
> >
> > obviously your "cd.." did not affect "pwd", as they have been executed
> > in different contexts.
> >
> > in order to do anything more complex, you have to create a
> > script-file, and run this via [shell].
> > e.g.
> > <snip>
> > #!/bin/sh
> > cd ..
> > pwd
> > </snip>
> >
> > and run "myscript.sh" via [shell] should give you ${WD}/..
> >
> > fgamsdr
> > IOhannes
> >
> >
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>
> Hello,
>
> By 'context', it is as if you start each time from the beginning (same
> 'initialization').
> You see that when you open a new shell by creating a new terminal window :
> 1) open new terminal window
> 2) enter 'cd ..' then return
> 3) enter 'pwd' then return
> 4) close terminal window
> 5) open new terminal window
> 6) enter 'pwd' then return
>
> As you can see the values returned by pwd are not the same because, each
> time you open a terminal window, you open a new shell.
> It is the same under Pd and the object [shell], each time you send a
> message to [shell], each time you open a new shell.
> That's why you need a script if you need to execute a sequence of several
> commands.
> ++
>
> Jack
>
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