meta_cache_list()
lists all packages.
meta_cache_update()
updates all metadata. Note that metadata is
automatically updated if it is older than seven days.
meta_cache_deps()
queries packages dependencies.
meta_cache_revdeps()
queries reverse package dependencies.
meta_cache_summary()
lists data about the cache, including its location
and size.
meta_cache_cleanup()
deletes the cache files from the disk.