Dash Is The Only Acceptable Symlink For /bin/sh

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Today we're going to fix a very simple problem with Arch Linux and that is that for whatever reason /bin/sh is symlinked to Bash, I don't know why but it's really easy to fix it and change the symlink to something that actually makes sense like Dash.

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[BrodieRobertson]

For anyone saying that Bash will run in POSIX only mode when it's linked to sh, I don't know if it just doesn't work or I have something wrong with my install but I've had bashisms in those scripts. But anyway, are you on a distro that does this by default or are you on something like Arch where you have to fix it yourself, let me know down below.

[bashisobsolete.pythonismyn]

POSIX asks "What methods will work reliably, efficiently and correctly across the board?" OpenBSD asked the same question and gave us the new, cleaned-up ksh. I used to advocate dash but now, there's no need. Get loksh and learn easily with these two books:
Learning the Korn shell 2nd edition, Robbins and Rosenblatt
Korn shell programming by example, Dennis O'Brien

[henninb]

I will be cleaning up my Arch distro, I had no idea it was setup like this. I appreciate the info.

[FLMKane]

I simply changed the symlink to dash on my fresh Artix install and it works perfectly. If I ever run into problems I'll just fix the offending script

[luxucn]

I always think of the arguments in 'ln' command similar to the ones in 'mv'/'cp' command, that is, the first file is what you already have and the second is what you want to create. This way there is less chance to accidentally overwrite a non-link file.

[Mpdarkguy]

5:00 I imagine you can just live boot, mount the fs and pacstrap bash again.

[FabioSantos-ypll]

in gentoo there is a tool called "eselect sh" to manage the simlink of /bin/sh

[FantabulousNoise]

Dash is actually a bit more tolerant than pure POSIX. It includes the local keyword for scoping, for example.

Yash is stricter, I wouldn't try it with those warnings.

4:20 "sudo !!" will run the last command as sudo ;)

[zx]

thanks for this video, was just about to create a pacman hook for dash on my own.

[edvonrattlehead]

shellcheck is a bit better as it gives you suggestions to fix bashisms and can direct you to an explanation as to why to correct syntax

[adammoussa]

I will suggest using a bare git repo instead of symlinking from your dotfiles directory

[itmanager]

man bash:
"If bash is invoked with the name sh, it tries to mimic the startup behavior of historical versions of sh as closely as possible, while conforming to the POSIX standard as well."

[wigust]

If your /bin/sh is Bash and you use #!/bin/sh shebang, then your script should be POSIX compatible without Bashisms.

[senninscorpion]

Damn, 916 packages installed! I managed to do an installation with everything I wanted and stayed below 500. Maybe I can reduce even more
480


How much of that you think is required because of your college?

[BiologyIsHot]

I don't like dash, my important scripts have the strangest errors that don't exist when I use bash/zsh and I figure out why

[meru_lpz]

I have symlinked /bin/sh -> /usr/bin/node. Sorry, not sorry ;)

[itmanager]

man bash:
"If bash is invoked with the name sh, it tries to mimic the startup behavior of historical versions of sh as closely as possible, while conforming to the POSIX standard as well."