Jonny Weese <[email protected]> added the comment:
> it seems strange/wrong to invoke an executable via "bash -c executable arg1
> arg2", rather than just "executable arg1 arg2"!
I agree it's strange to invoke a single executable that way, but remember that
-c allows a string of arbitrary bash code. (It just happens that bash code that
consists of a single executable calls it -- useful behavior in a shell.)
Consider:
$ bash -c 'f() { printf "%s\n" "$@"; }; f "$@"' - foo bar baz
foo
bar
baz
> 1) If there exist use cases for setting `shell=True` and doing "bash -c
> my_executable arg2 arg3", then the documentation should say something like
> the following:
> """
> Using `shell=True` invokes the sequence of args via `bash -c`. In this case,
> the first argument MUST be an executable, and the subsequent arguments will
> be stored as bash parameters for that executable (`$0`, `$1`, etc).
> """
I'd be okay with clearer docs, but the given language is not quite right. For
example, the actual shell call is /bin/sh (and depends on the platform). And,
as described above, I think it would be too restrictive to say the first
argument must be a single executable.
On the other hand, I disagree with option 2. I think raising an error would be
very restrictive, and secretly quoting the argument could be surprising for
(the few) people who understand the underlying shell mechanism.
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue39692>
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