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From: dana <dana@dana.is>
To: "Jun T" <takimoto-j@kba.biglobe.ne.jp>
Cc: zsh-workers@zsh.org
Subject: Re: ksh compatibility: initial value of $_
Date: Wed, 05 Apr 2023 03:14:06 -0500	[thread overview]
Message-ID: <838816ad-0337-452b-94d1-e18a17c33c78@app.fastmail.com> (raw)
In-Reply-To: <2A0716F2-F80B-4357-87AA-0A9881A52CEC@kba.biglobe.ne.jp>

On Tue 4 Apr 2023, at 11:24, Jun. T wrote:
> The following is my revised path.
> # Since $_ is almost always set in environment (though sometimes
> # not useful), this may be going too far (or to excess, don't know
> # the correct words).

I had written a patch very very similar to this in 2018 because of
workers/42193 (as well as users/22875, users/18199, &c.). I wasn't thinking
about $_ at the time; instead, i had created a ZSH_EXECUTABLE_PATH parameter
that resolved the path the first time it was referenced, because i was worried
that it was too niche to waste I/O on it for every invocation of the shell. In
the end i didn't submit the patch because it still felt too elaborate...

Anyway, would it make sense to revive the idea of having a dedicated variable
for it, so you can get the absolute path to the shell regardless of the
environment or what commands might have run before you could capture $_? That
would somewhat address your fear that it's too excessive for how rarely it'd
be used, at least

PS: bash has a similar dedicated parameter, just called BASH... but it doesn't
try to be this accurate about it. If it's a log-in shell, it will use $SHELL,
otherwise it basically does the 'guess the absolute pathname' part of your
getmypath()

dana


  parent reply	other threads:[~2023-04-05  8:15 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-28  1:52 Bart Schaefer
2023-03-23 10:40 ` Jun T
2023-03-31  8:18   ` Jun T
2023-03-31 14:31     ` Jun. T
2023-03-31 17:45       ` Bart Schaefer
2023-04-03 11:16         ` Jun. T
2023-04-03 16:48           ` Bart Schaefer
2023-03-31 19:02       ` Bart Schaefer
2023-03-31 19:03         ` Bart Schaefer
2023-04-03 12:13     ` Jun. T
2023-04-03 16:50       ` Bart Schaefer
2023-04-04 16:24         ` Jun. T
2023-04-05  1:03           ` Oliver Kiddle
2023-04-05  8:15             ` zeurkous
2023-04-05  9:00               ` Oliver Kiddle
2023-04-05 16:24             ` Jun. T
2023-04-05  8:14           ` dana [this message]
2023-04-05 18:16             ` Jun. T
2023-04-08  4:03               ` dana
2023-04-08 16:22                 ` Oliver Kiddle
2023-04-09 13:30                   ` Jun. T
2023-04-10  0:51                     ` Jun T
2023-04-15  5:02                   ` Felipe Contreras
2023-04-15 22:24               ` Bart Schaefer

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