Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Bash 5.0 released

lists.gnu.org

Post reply on HN
Print view View original

121–130 of 306 posts

Re: Bash 5.0 released

#121

Post by gnulinux »

int_19h wrote: post #118
gnulinux wrote: post #112

Earlier quoted context omitted.

What percent of Unices come with Powershell today? I can write my code in bash and forget about it. Or if I'm supporting less systems (most linux + macOS + most modern Unices) I can write my code in perl or python. Powershell? Thanks but no thanks.

> I can write my code in bash and forget about it. In practice, this approach often results in code that works only on Linux, or on Linux and macOS. I especially hate it when people shove #!/bin/bash as a shebang, and doubly so when it's in scripts that are a part of some npm package. (On BSDs, Bash is not installed out of the box, and when it is installed, it's not in /bin, since it's not in the base system.) Still,…

I think this is a good point but, there is an implicit but well known notion that if you write bash and care about platform coverage, you just write bourne shell. I didn't explicitly write it, but I assumed I would write bourne shell, and whatever shell in random Unix will be able to handle it as well as bash in linux||macOS. As a python lover, I simply can't find one reason to use any other scripting language other than python as long as I accept poor performance and dependencies. I can't see what problem Powershell is supposed to solve.

Re: Bash 5.0 released

#122

Post by h1d »

giancarlostoro wrote: post #2

Any recommended reading for Bash? I'm somewhat new to it and it's interesting ways of getting things done. I've used it minimally in the past, but have found myself writing a 100> LOC script, which I can't help but feel I'm likely over-complicating certain bits and pieces.

You could learn bash to understand existing scripts but you could also learn fish, which can be a more sane looking script than bash, if you're writing your own.

Re: Bash 5.0 released

#123

Post by Carpetsmoker »

ajross wrote: post #60
Carpetsmoker wrote: post #43

Earlier quoted context omitted.

The problem is that GPL3 has more restrictions than just "publish the code". That's why projects such as FreeBSD, OpenBSD, etc. also won't include GPL3 code, as including GPL3 code would restrict what you can and can't do with the entire system. I assume that Apple's reasoning is similar.

Can you name them? It's not exactly snark. My experience is that almost everyone with strong GPLv3 opinions turns out not to actually object to the terms themselves when discussed in isolation. To head off: it's not the patent grant. Apache 2 has a very similar patent grant and everyone is fine with it.

Eh, is it 2007 again? Hasn't this been discussed to death already? I have little interest to repeat it again; this discussion has been on-going for ten years already (longer if we count GPL vs. BSD discussions, which are roughly similar). Everyone should be familiar with the arguments by now; I trust you're already familiar with mine.

I understand that you're well-intentioned, but I find the suggestion that I'm somehow not informed to be rather patronizing to be honest.

Re: Bash 5.0 released

#124

Post by h1d »

rb808 wrote: post #68
giancarlostoro wrote: post #2

Any recommended reading for Bash? I'm somewhat new to it and it's interesting ways of getting things done. I've used it minimally in the past, but have found myself writing a 100> LOC script, which I can't help but feel I'm likely over-complicating certain bits and pieces.

From the google Shell Style Guide: "If you are writing a script that is more than 100 lines long, you should probably be writing it in Python instead. " https://google.github.io/styleguide/shell.xml

LOC alone doen't mean much. I have a backup script in fish of 400+ lines of code because it tries to dump data out of different sources like MySQL, PGSQL, InfluxDB, /etc files and others. Just use what feels comfortable achieving the task.

Re: Bash 5.0 released

#125

Post by h1d »

shpx wrote: post #53
_emacsomancer_ wrote: post #40

Earlier quoted context omitted.

I assume you can install newer versions of Bash on macOS though? (But it certainly suggests to me that macOS isn't actually the easiest out-of-the-box solution if your workflow includes anything more than web browsing.)

On macOS almost everyone uses the homebrew package manager https://brew.sh . Installing bash is harder because you have to add the filepath of the new bash binary to /etc/shells and then set that filepath as your default shell, but brew install bash echo /usr/local/bin/bash | sudo tee -a /etc/shells chsh -s /usr/local/bin/bash and if you're on macOS and still haven't heard of homebrew, you first need to install it wi…

You mean, every developer, not everyone.

Re: Bash 5.0 released

#126

Post by shpx »

gnulinux wrote: post #98
shpx wrote: post #53

Earlier quoted context omitted.

On macOS almost everyone uses the homebrew package manager https://brew.sh . Installing bash is harder because you have to add the filepath of the new bash binary to /etc/shells and then set that filepath as your default shell, but brew install bash echo /usr/local/bin/bash | sudo tee -a /etc/shells chsh -s /usr/local/bin/bash and if you're on macOS and still haven't heard of homebrew, you first need to install it wi…

That command makes my eyes twitch. This sort of "download random stuff from internet, then pipe them to ruby/perl/python" madness should end, like right now. I'm assuming you're a reasonable person who knows what that commands does. Can you really not see how people can misuse commands like this to execute arbitrary code on people's computers, even experienced engineers if they carelessly copy-paste code like this. A…

That command curls a ruby file from the Homebrew repository on Github. If that Github repo (or Github) is compromised, then no matter how you installed homebrew, you are going to get hacked the next time you run `brew update`, which by default is run on every `brew install`.

For me, the odds of that repo being compromised for long enough are outweighed by the convenience. This has been brought up on HN before and I'm not convinced.

Re: Bash 5.0 released

#127

Post by _kst_ »

dualbus wrote: post #116
_kst_ wrote: post #84

With this release, bash now has three built-in variables (um, I mean "parameters") whose values are updated every time they're read: $RANDOM yields a random integer in the range 0..32767. (This feature was already there.) $EPOCHSECONDS yields the whole number of seconds since the epoch. $EPOCHREALTIME yields the number of seconds since the epoch with microsecond precision. I'm thinking of a new shell feature that wou…

You mean like Ksh's discipline functions? dualbus@system76-pc:~$ ksh -c 'date=; date.get() { .sh.value=$(date +%s); }; echo $date; sleep 5; echo $date' 1546926637 1546926642 See: https://docs.oracle.com/cd/E36784_01/html/E36870/ksh-1.html ("Discipline Functions")

Yes, just like that!

Re: Bash 5.0 released

#128

Post by zwischenzug »

giancarlostoro wrote: post #2

Any recommended reading for Bash? I'm somewhat new to it and it's interesting ways of getting things done. I've used it minimally in the past, but have found myself writing a 100> LOC script, which I can't help but feel I'm likely over-complicating certain bits and pieces.

You can’t beat the man page if you’re patient with it. Or you could try my book:

https://leanpub.com/learnbashthehardway

Re: Bash 5.0 released

#129

Post by h1d »

petre wrote: post #96
pornel wrote: post #32

Reminder that 2019 version of macOS ships with 2007 (last GPL2) version of Bash, and will never ship with any newer version. /bin/bash --version GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin18) Copyright (C) 2007 Free Software Foundation, Inc. macOS used to be an awesome developer machine with good tools out of the box. Now the built-in tools are just a bootstrap for their own replacement via Homebrew. Lik…

It also ships a recent version if zsh. But I agree, you're better off with Linux if you want a developer box and deploy on Linux.

How's that? The quality and amount of GUI tools are far more complete in macOS than Linux desktop and you can just run a Linux VM to mimic the deployment server.

Re: Bash 5.0 released

#130

Post by scarejunba »

_kst_ wrote: post #84

With this release, bash now has three built-in variables (um, I mean "parameters") whose values are updated every time they're read: $RANDOM yields a random integer in the range 0..32767. (This feature was already there.) $EPOCHSECONDS yields the whole number of seconds since the epoch. $EPOCHREALTIME yields the number of seconds since the epoch with microsecond precision. I'm thinking of a new shell feature that wou…

What is the advantage of this technique over a shell built-in or function that echoes that value?
Post reply on HN