Unify MILL_USER_CACHE_DIR

[Flowdalic]

No description provided.

[lefou]

Looks good to me. But I now wonder if the ${VAR:-DEFAULT} expression is supported by all shells?

[Flowdalic]

But I now wonder if the ${VAR:-DEFAULT} expression is supported by all shells?

It is part of the POSIX sh specification. And most systems have a POSIX (compatible) shell installed and as sh in PATH, and this is mandated for POSIX compliant systems.

"All shells" is a pretty wide target. But all relevant shells and POSIX'ish shells support it. This include bash and zsh. But not, for example, csh, which is a totally different kind of beast (and probably not installed as sh in PATH).

[Flowdalic]

Furthermore, shellcheck automatically selects the POSIX-sh dialect if the she-bang is sh. So as long as shellcheck does not complain, your script should be widely portable on all platforms, since POSIX-sh is the least common denominator.

[lefou]

Thanks!