NixOS 18.03 Released

Re:NixOS 18.03 Released by tathougies on Friday April 06, 2018 @11:25AM (#16773940)

You shouldn't be using /bin/bash anyway. The proper she-bang is '#!/usr/bin/env bash', which works on nix. The location of bash in /bin/ is actually not standard at all, despite some linux distributions doing that. In particular, the BSDs also do not have bash in /bin. This is why using '/usr/bin/env bash' is more portable

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Re:NixOS 18.03 Released by eikenberry on Friday April 06, 2018 @01:36PM (#16775287)

> /usr/bin/env

That won't work everywhere either as the location of 'env' is not a fixed standard either. Eg. In some *nix's its at /bin/env.

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Re:NixOS 18.03 Released by pxc on Saturday April 07, 2018 @12:31PM (#16781429)

What modern/surviving Unix-likes don't have even a symlink in `/usr/bin/env`?

I'm not 100% sure on all of these, but every one of the dozens of Linux distros I've used has `/usr/bin/env`. macOS has it, and it looks like FreeBSD does, too, and so does NetBSD.

Who are the oddballs? Does it include any of the free Unices?

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Re:NixOS 18.03 Released by pxc on Sunday April 08, 2018 @03:46AM (#16785104)

(I'm not trying to be shitty; I'd really like to know. I spent some time Googling about conventions for the `env` command, and examples of incompatible systems. The only ones I found were two old, proprietary Unices. I got tired of searching and was hoping someone who knows a few examples offhand could help me out.)

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Re:NixOS 18.03 Released by muxator on Friday April 06, 2018 @01:06PM (#16774939)

I've always mechanically written '#!/bin/bash' as my shebang for bash script, while I normally use '#!/usr/bin/env python' for python scripts. In retrospect, that sounds obviously incoherent.

I would like to know if there is some common practice/standard around using '/usr/bin/env' in shebangs.

Could you please elaborate more?

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Re:NixOS 18.03 Released by wereHamster on Friday April 06, 2018 @11:35AM (#16774020)

But is `/usr/bin/env` standard?

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Re:NixOS 18.03 Released by eridius on Friday April 06, 2018 @02:00PM (#16775595)

Incidentally, macOS, whose CLI is derived from BSD, does in fact have /bin/bash.

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Re:NixOS 18.03 Released by satbyy on Friday April 06, 2018 @11:35AM (#16774024)

Conversely, Python's PEP394 explicitly discourages `/usr/bin/env python`, so there's that. (I know why the PEP says so, just pointing out that it differs from Nix style)

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Re:NixOS 18.03 Released by adamtulinius on Friday April 06, 2018 @11:48AM (#16774143)

The PEP doesn't even mention /usr/bin/env. Look for yourself: https://www.python.org/dev/peps/pep-0394/

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