os.shell, recursion, encryption

55555 55555 at dakotacom.net
Tue Feb 15 22:22:36 CET 2000


On Mon, 14 Feb 2000 18:37:58 -0000, "Trent Mick" <trentm at ActiveState.com> 
wrote:
> > Thanks for the lesson.  It's a little clearer, but now I question 
> > whether
> > this can be used for what I want to do.  It seems like popen creates a
> > file.  I don't want to do that.  Instead, I'd like to simply run a
> > commercial program with a command like 'pkzip asdf.zip *.*'.  I gave 
> > the
> > following a try and it came back with "bad command or filename."  Am I 
> > on
> > the right path or should I be using a different function than popen?
> > os.system() doesn't work and I don't know what mode to use for spawnv.
> > Thanks again.
> >
> > import os
> > zipExe='c:/progra~1/pkzipdos/pkzip.exe'
> > os.popen('> '+zipExe+' asdf.zip *.*', 'w')
> 
> I have not been following this thread but methinks you want to say:
> 
> import os
> zipExe = 'c:/progra~1/pkzipdos/pkzip.exe'
> zipOutput = os.popen(zipExe + ' asdf.zip *.*', 'r')
> print zipOutput.readlines()

I gave this a shot.  I actually don't care about the return from pkzip, 
but I think this would work.  Unfortunately, an empty list is returned and 
there is no evidence that pkzip was ever executed.  Any ideas?

> 
> The p in popen stand for 'pipe' I believe. You are openning a pipe to 
> the
> command that you are running (here pkzip). The 'bad command or filename' 
> is
> comming from the greater than sign '>' that you prefixed the command 
> with. I
> think you may be using the Perl syntax for open(). If you still get 'bad
> command or filename' then pkzip.exe is not where you think it is or
> something else is broken.
> 
> As well you want to open the pipe for reading because you want to get 
> the
> status output from pkzip (right?). If you don't care about the zip 
> status
> output then try
> 
> import os
> zipExe = 'c:/progra~1/pkzipdos/pkzip.exe'
> os.system(zipExe + ' asdf.zip *.*')
> 
> Again, when you say that os.system() was broken as well, I think the 
> greater
> than sign is your problem.

I was using that one without the greater than sign, but I don't want to 
use the above because I'm walking through a directory tree and it would 
spawn too many windows that would all need to be closed.

> 
> Hope this helps,
> 
> Trent
> 
> 
> 


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