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48131/0003: FAQ: 3.31: Move two paragraphs unchanged, reordering them

Factored out from the next patch for readability of the diff.

The answer, as it stands in this commit, doesn't flow correctly.  In
order to keep the diffs small and easy to follow, this commit simply
adds a TODO to record this issue, a TODO which is fixed by the next
commit in this series (the child of this commit).  Thus, a request:

DEAR PEOPLE FROM THE FUTURE: Please don't create new branches off this
commit; create them off the parent commit or off the child commit
instead.  Thank you.
This commit is contained in:
Daniel Shahaf 2021-03-03 00:18:24 +00:00
parent 2ad942b758
commit 7c201b1b3e
2 changed files with 20 additions and 14 deletions

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@ -1,5 +1,8 @@
2021-03-26 Daniel Shahaf <d.s@daniel.shahaf.name>
* 48131/0003: Etc/FAQ.yo: FAQ: 3.31: Move two paragraphs
unchanged, reordering them
* 48131/0002: Etc/FAQ.yo: FAQ: 3.31: Tweak summary paragraph
* 48131/0001: Etc/FAQ.yo: FAQ: 3.31: Add a one-sentence summary

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@ -2065,6 +2065,22 @@ label(331)
many other pairs of closely-related languages, such as Python 2 and
Python 3; C and C++; and even C89 and C11.)
When bash and zsh behave differently on the same input, whether zsh's
behaviour is a bug does not depend on what bash does on the same
input; rather, it depends on what zsh's user manual specifies.
(By way of comparison, it's not a bug in Emacs that mytt(:q!) doesn't
cause it to exit.)
Since the bash and zsh languages do have a common subset, it is
feasible to write non-trivial plugins that would run under either of
them, if one is sufficiently familiar with both of them. However,
a difference between bash's behaviour and zsh's does not imply that
zsh has a bug. It myem(might) be a bug in zsh, but it might also be
a bug in bash, or simply a difference that isn't a bug in either shell
(see link(3.1)(31) for an example).
COMMENT(TODO: Move here the paragraph about "That's the answer for..." and reverse it)
So, don't run bash scripts under zsh. If the scripts were written for
bash, run them in bash. There's absolutely no problem with having
mytt(#!/usr/bin/env bash) scripts even if mytt(zsh) is your shell for
@ -2076,6 +2092,7 @@ label(331)
learning curve. Once you're used to zsh, you can decide for each
script whether to port it to zsh or keep it as-is.
COMMENT(TODO: That's the paragraph the comment above refers to)
That's the answer for myem(scripts), i.e., for external commands that
are located in tt($PATH), or located elsewhere and are executed by
giving their path explicitly (as in mytt(ls), mytt(/etc/rc.d/sshd),
@ -2085,20 +2102,6 @@ label(331)
pasted interactively at the shell prompt emdash() the answer is
different.
Since the bash and zsh languages do have a common subset, it is
feasible to write non-trivial plugins that would run under either of
them, if one is sufficiently familiar with both of them. However,
a difference between bash's behaviour and zsh's does not imply that
zsh has a bug. It myem(might) be a bug in zsh, but it might also be
a bug in bash, or simply a difference that isn't a bug in either shell
(see link(3.1)(31) for an example).
When bash and zsh behave differently on the same input, whether zsh's
behaviour is a bug does not depend on what bash does on the same
input; rather, it depends on what zsh's user manual specifies.
(By way of comparison, it's not a bug in Emacs that mytt(:q!) doesn't
cause it to exit.)
In summary,
if you'd like to run a bash script or plugin under zsh, you must port the script or plugin
properly, reviewing it line by line for differences between the two