Runs of consecutive integers may be abbreviated a-b, where a is the first integer in the run and b is the last. The article list may be empty. Methods that add or move newsgroups affect the newsgroup order. By default, these methods put newsgroups at the end of the newsrc file. If the other newsgroups are not sorted alphabetically, put the group at an arbitrary location.
Indices are zero-based.
Negative indices count backwards from the end of the list. The object contains no newsgroups. Returns true on success. In either case, if the destination file exists, it is renamed to file .bak . In scalar context, returns an array reference.