From: Pablo Rodriguez via ntg-context <ntg-context@ntg.nl>
To: ntg-context@ntg.nl
Cc: Pablo Rodriguez <oinos@gmx.es>
Subject: Re: check installed program using Lua
Date: Tue, 2 Nov 2021 19:59:14 +0100 [thread overview]
Message-ID: <330529dd-d972-35f5-c8b0-f047be8d41e4@gmx.es> (raw)
In-Reply-To: <A89D28B3-0B0D-4C82-8C0D-43EB65AF7C47@bittext.nl>
On 11/1/21 3:10 PM, Taco Hoekwater via ntg-context wrote:
>> [...]
>> Is there a way to wrap os.exec() in the sample so that it only runs if
>> "dir" is available?
>
> if os.which(‘dir’) then
> ...
> end
>
> But note that os.which() may be unreliable in various cases (like it
> will fail for shell/command interpreter builtins, in cron jobs, in
> special scripted environments, and may incorrectly succeed for
> disabled/forbidden commands), as it just runs through the PATH
> environment variable to check for executable file existence.
Many thanks for your reply, Taco.
This is exactly what I needed.
> Often times, it is better to just try to run the command to see if
> that produces satisfactory results.
It makes sense, but I cannot do that on foreign computers.
Many thanks for your help again,
Pablo
--
http://www.ousia.tk
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next prev parent reply other threads:[~2021-11-02 18:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-01 13:26 Pablo Rodriguez via ntg-context
2021-11-01 14:10 ` Taco Hoekwater via ntg-context
2021-11-02 18:59 ` Pablo Rodriguez via ntg-context [this message]
2021-11-01 16:13 ` Hans Hagen via ntg-context
2021-11-02 19:01 ` Pablo Rodriguez via ntg-context
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