How to suppress Pkg messages?

General Usage
1 
pkrysl@BlackCube MINGW64 /d/BoneShaker.jl (main)                                                                                
$ julia --quiet                                                                                                                 
   Resolving package versions...                                                                                                
  No Changes to `D:\SublimeJulia-1.9\assets\.julia-1.9.3-depot\environments\v1.9\Project.toml`                                  
  No Changes to `D:\SublimeJulia-1.9\assets\.julia-1.9.3-depot\environments\v1.9\Manifest.toml`                                 
   Resolving package versions...                                                                                                
  No Changes to `D:\SublimeJulia-1.9\assets\.julia-1.9.3-depot\environments\v1.9\Project.toml`                                  
  No Changes to `D:\SublimeJulia-1.9\assets\.julia-1.9.3-depot\environments\v1.9\Manifest.toml`                                 
  Activating project at `D:\BoneShaker.jl`                                                                                      
julia>

Is it possible to make Julia “real quiet”?

2

Use the io keyword argument, like Pkg.activate(“.”; io=devnull)

4 Likes
3

I’ve almost used this myself, but doesn’t this also mean that errors won’t be displayed?

4 
julia> Pkg.add("NonExisting"; io=devnull)
ERROR: The following package names could not be resolved:
 * NonExisting (not found in project, manifest or registry)
   Suggestions: NonconvexMetaheuristics NonconvexMultistart
Stacktrace:
5

So io is really stdio by the looks of it? It would be nice if the Pkg docstrings actually said something about io, IIRC most don’t even mention its existence.

6

By default io is stderr for all commands except Pkg.status where it is stdout, IIRC. This is only used for any Pkg-internal IO: in the example above Pkg.add throws an error, and the REPL frontend chooses to print this to stderr.