Thank you "Eryksun" and "EikeWek" for your responses. It is this sort of thing that begins to pull one out of the newbie into the intermediate category. I'm grateful. alex
> I've not found anywhere a clear explanation of when not to set shell=True. > If the command line must be interpreted by the shell then clearly this > must be set. So the question that comes up is why not set it always? > In an effort to investigate, I came up with the following script that > indicates that the shell looks at only the first string in the array if > the first parameter is an array rather than a string. Switching between > cmd being a string vs an array and shell being set or not set gives 4 > possibilities. > Any comments? > > #!/usr/bin/env python > > # file : test.py (Python 2.7, NOT Python 3) > # Running on Linux platform (Ubuntu.) > print 'Running "tes.py"' > > import subprocess > > cmd = ["ls", "-l"] > # cmd = "ls -l" > p = subprocess.Popen(cmd, > # shell=True, > stdout=subprocess.PIPE, > stderr=subprocess.PIPE) > (s_out, s_err) = p.communicate() > print "Std_out returns:\n%s<end>\nStd_err returns:\n%s\n<end>"%\ > (s_out, s_err, ) > > > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > > _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
