"App-Options combines command-line arguments, environment variables, option files, and program defaults..."

Other interesting possibilities:

• Config-Easy
• AppConfig
• Getopt-ArgvFile
• Config-Frontend in conjunction with Config-Backend-File, Config::Backend::String, etc.

Of these, the one I think holds the most promise is the last, because it was clearly designed with extensibility in mind. Config-Frontend doesn't seem to come with a backend for reading the command line, but one could easily be written.

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Background

I went scrounging around CPAN for modules that would support simple, flexible application configuration management. Here's what I came up with.

First, there are modules which simply read/write certain config file formats:

For example:

• Config-Trivial
• Config-IniFiles
• Config-Tiny
• Config-General
• Config-IniHash
• ConfigReader-Simple
• Config-Objective
• Config-Natural

There are modules which try to be config file polyglots:

• Config-Auto

There's a handful of modules that try to tackle the problem of locating config files:

• Config-Auto
• Config-Find
• Config-IniSearch

Then there are modules that try to handle more sources of config info than just files, e.g. integrating command-line options with configfile data.

Those are the ones I listed in my reply, above.

PS - I'm not trying to downplay the power of any of these modules. I realize that some of them do a lot more than what I've characterized here. I'm just focusing on the types of data sources supported.

PPS - If you know of a module not listed here that you think ought to be, please /msg me first, rather than reply. Thanks.