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bug#29157: 25.3; Eshell parsing fails sometimes, e.g. "date" and "sed"

From: Pierre Neidhardt
Subject: bug#29157: 25.3; Eshell parsing fails sometimes, e.g. "date" and "sed"
Date: Sat, 25 Nov 2017 20:36:36 +0100
User-agent: mu4e 0.9.18; emacs 25.3.1

Eli Zaretskii <address@hidden> writes:

>> The issue here is mostly my lack of awareness about what is an Elisp
>> command and what is a system program.
> Why do you need to know that?
> If you want to know that so you could always get the same responses as
> from another system shell, then perhaps we should have an option to
> tell Eshell to always invoke an external program (maybe we already
> have such an option, but I couldn't find it).

No, not like that, more like a friendly reminder: "this 'date' behaves
the Eshell way, while that 'rmdir' is the system program".

>> Maybe having different syntax highlighting for the "verb" depending on
>> whether it's a system program or an Elisp command would help avoiding
>> the pitfall.
> Isn't it true that a verb that doesn't begin with a '*' is _never_ a
> system program in Eshell?

I'm tempted to answer "no, it's not true", but we might be

As far as I got it, the '*' is here to force Eshell to use the system
program, while no '*' tells Eshell to use its own version if available,
or the system program otherwise.

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