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The search service can find package by either name (apache), provides(webserver), absolute file names (/usr/bin/apache), binaries (gprof) or shared libraries (libXm.so.2) in standard path. It does not support multiple arguments yet...
The System and Arch are optional added filters, for example System could be "redhat", "redhat-7.2", "mandrake" or "gnome", Arch could be "i386" or "src", etc. depending on your system.
IO::Prompt::Tiny is a nice module to use for basic prompting. It properly detects interactive sessions, and since it's based on the 'prompt()' routine from the ExtUtils::MakeMaker manpage, it's highly portable. But the IO::Prompt::Tiny manpage is intentionally minimal. Often one begins wrapping it in logic to validate input, retry on invalid, limit number of attempts, and alert the user to invalid input. the IO::Prompt::Hooked manpage adds simple validation, attempt limiting, and error handling to IO::Prompt::Tiny's minimalism. It does this by allowing you to supply simple Regexp objects for validation, or subroutine callbacks if you need finer control. "But we already have the IO::Prompt manpage for non-trivial needs.", you might be thinking. And you're right. But have you read its POD? It's far from being simple, and is not as portable as this module. the IO::Prompt::Hooked manpage aims to provide the portability of IO::Tiny, and easy to use hooks for input validation.
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