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Re: Help-bash Digest, Vol 144, Issue 20
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From: |
Kerin Millar |
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Subject: |
Re: Help-bash Digest, Vol 144, Issue 20 |
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Date: |
Sat, 2 Dec 2023 22:57:14 +0000 |
On Sun, 3 Dec 2023 05:22:41 +0700
Budi <budikusasi@gmail.com> wrote:
> >
> > On Bash' hash
>
>
> what actually is it all about ?
It is a builtin command used for inspecting and manipulating the shell's
internal hash table of command names to their fully qualified paths.
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/hash.html
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_01_01
(section 1.e)
The purpose of the table is to avoid repeatedly walking PATH in the course of
locating previously executed external commands. Presumably, to do so would have
been very expensive back in the late 1970s.
> As needing definitive answer for
> https://news.ycombinator.com/item?id=38458996
It is unrelated to the requirement laid out by the above thread, which is
essentially requesting a solution to a non-problem in any operating system that
implements demand paging, Linux included.
https://en.wikipedia.org/wiki/Demand_paging
--
Kerin Millar