On 2019-02-19 18:31, Grant Edwards wrote:
On 2019-02-19, Chris Angelico <ros...@gmail.com> wrote:
On Wed, Feb 20, 2019 at 5:05 AM Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote:
On 19 Feb 2019 13:58:18 GMT, jureq <ju...@nowhere.no> declaimed the
following:
>> I could also use the 2 first bytes of a file and determine if the file
>> is a binary because on Windows, the executable files start with b'MZ'.
>
>Is .bat executable?
Or any of the extensions on
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.py;.pyw
I guess you have to define the question better for Windows, since
there's no single definition of "executable". If you mean "typing just
the base name of this file at the shell will result in it being run",
then PATHEXT is the correct answer. If you mean "this thing is
actually inherently executable", then you probably want to check if it
begins MZ, but that's not certain (COM files still seem to be
supported, and they have no header whatsoever). If you mean
"double-clicking this thing will run it", I think there are tools that
allow you to do the registry lookup conveniently to see if something's
associated.
FWIW, I've noticed that afer downloading a .exe under Linux and
scp'ing the file to a Windows machine, it wont run when double-clicked
until I fire up a Cygwin shell and do a
chmod +x <whatever>.exe
[I assume there's native Windows point-and-grunt means for doing that
as well.]
So, in addition to the suffix and associations, there's some sort of
file-system meta-data that determines whether a file is "executable"
in some contexts.
I've never heard of a Windows equivalent of "chmod +x". If I copy the
contents of a .exe into a new file and give it a .exe extension, it just
works.
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