I'm assuming you may not be familiar with Julia, but basically every "tool" you use in Julia is a library.

It requires importing it in the Julia REPL or activating a new contextual REPL within the Julia REPL. You can then start calling the functions from the imported module. You don't really get standalone Julia tools, it's all libraries and you're always starting the REPL, importing something, then doing stuff from inside the REPL.

For example, installing a package in Julia is the following steps:

    julia
    ] # keybinding which activates pkg mode
    add StaticArrays

You could do it also like this:

    julia -e 'use Pkg; Pkg.add("StaticArrays")'

There is no `julia-pkg add StaticArrays`, unfortunately.