Help me understand juliaup

General Usage
1

I have a Mac and I use julia
I install julia on my mac manually
I wish to use juliaup
However I failed to find documentation about juliaup (especially about how it stores various version of julia internally)

This is what I know about juliaup

  1. juliaup uses channel
  2. juliaup hides julia and instead replaces julia executable with julialauncher executable
  3. to use julia I type “julia +1.6 options options” on the commandline
  4. the julialauncher determines that I wanted julia 1.6.x and launches it

What I WANT to know is

  1. Where do juliaup puts varies version of julia on my mac
  2. Where is julialauncher located
  3. What happens to my existing julia that I have installed manually?
  4. Where can I find documentation about how juliaup works (ie question 1 and 2 and 3)
  5. Who do I contact for help and questions
  6. What happens to my existing symbolic link below after I install juliaup
$ cd /usr/local/bin
$ ls -l julia
lrwxr-xr-x  1 ssiew  admin  63 28 Dec 14:41 julia -> /Applications/Julia-1.10.app/Contents/Resources/julia/bin/julia

Regards

2

If Mac is like Linux, just use symlinks with the officials binaries and you are perfectly fine… I have installed using symlinks almost all versions of Julia from 0.7 onward and never got a problem…:

3

Juliaup installs its small launcher binary at ~/.julia/juliaup/bin/julia. As long as ~/.julia/juliaup/bin appears in your PATH ahead of your existing install — and IIRC the installer prompts you and does this for you if you choose — then it’ll gracefully supersede any existing install. It doesn’t use/replace/touch existing installs.

The individual Julia installs it manages are independently stored in ~/.julia/juliaup/ — and they’re exactly the same as the official binaries. I used to manually install and manage symlinks to each version myself, too, but juliaup is one of those things that just works™; it’s lovely.

It’s open source. The project home is GitHub - JuliaLang/juliaup: Julia installer and version multiplexer.

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