Why jlenv?

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Support specifying application-specific Julia versions with .julia-version file.
Let you change the global Julia version on a per-user basis.
Allow you to override the Julia version with an environment variable.

Need to be loaded into your shell. Instead, jlenv’s shim approach works by adding a directory to your $PATH.
Override shell commands like cd or require prompt hacks. That’s dangerous and error-prone.
Have a configuration file. There’s nothing to configure except which version of Julia you want to use.
Install Julia. You can build and install Julia yourself, or use julia-build to automate the process.
Manage Packages. Pkg is a better way to manage application dependencies.
Require changes to Julia libraries for compatibility. The simplicity of jlenv means as long as it’s in your $PATH, nothing else needs to know about it.