Re: On the sensibility of portable scripts

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From	"Carlos E.R." <robin_listas@es.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: On the sensibility of portable scripts
Date	Mon, 27 Apr 2026 13:07:27 +0200
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On 2026-04-27 08:19, Lew Pitcher wrote:
> On Thu, 23 Apr 2026 22:13:19 +0000, Lew Pitcher wrote:
> 
>> On Thu, 23 Apr 2026 23:05:14 +0200, Carlos E.R. wrote:
>>
>> [snip]
>>> What is not right is declare in a script that it uses the common shell,
>>> and then have bashisms inside.
>>
>> Agreed. That's why my script does /not/ have bashisms inside.
>>
>> It uses the (POSIX shell) common subset that ash, bash, dash, ksh,
>> and zsh all support.
> 
> When writing scripts for distribution, it seems to me to be
> common sense to write those scripts in a manner such that they
> need as little customization as possible. You cannot know all
> the quirks of the environment in which it will run, but you can
> dictate some minimum requirements for the script.
> 
> If, for instance, you write a Perl or Python script for distribution,
> it must not, to be useful to the intended audience, assume much more
> than the common components of the selected language; a Python 3 script
> won't be much use on a system that only has Python 2 installed, unless
> it restricts itself to the subset of Python 3 syntax and features that
> are common with Python 2. Similarly, a bash script won't be of much use
> on a system that only has Korn shell installed, if it uses features
> only available in bash.

I disagree. A script published for bash, will be of use on any machine 
that has bash.

On your python script example you talked about versions of python, not 
about having a different interpreter like perl. If python is not 
installed, you see no problem demanding they install python.

Here, it is the same. You can not talk of having korn instead of bash, 
when the script clearly asks for bash.

Potatoes and lemons.

Now, if the scripts asks for "shell", that's a different thing.


...

> While some will argue against this, for their own reasons, I will
> continue to distribute POSIX shell compatible scripts.
> 
> For what it's worth.

That's fine, as long as the SHEBANG writes "sh".

-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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                Re: On the sensibility of portable scripts Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-27 08:12 +0000
                Re: On the sensibility of portable scripts "Carlos E.R." <robin_listas@es.invalid> - 2026-04-27 12:42 +0200
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                Re: On the sensibility of portable scripts rbowman <bowman@montana.com> - 2026-04-27 18:06 +0000
                Re: On the sensibility of portable scripts "Carlos E.R." <robin_listas@es.invalid> - 2026-04-27 13:07 +0200
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