There is a strange ommision in the commands module, you
can safely get the ls -ld of a file since it
shell-quotes its argument, but yet you cannot safely
run other commands since the mkarg function isn't
"public" (well, not if you only follow the docs, or do
import *).

In addition, since commands.py seems to be unix only,
it would be better for the mkarg functionality to be
moved to the os module so that on other OSes you could
use it with os.system, etc. (well, I guess maybe it
would belong in the os-specific modules like posix, nt,
etc, since its probably varies)

(Though it should probably be given a better name in
that case, like os.mkshellarg or somesuch.)

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With the addition of the subprocess module in Python 2.4, I
think this is no longer necessary.  Therefore, I am closing it.