N Uses the count parameter. This is used if there are multiple entries in the archive with the same name. Extract or delete instance count of the given name from the archive. Preserve the original dates of members when extracting them. If you do not specify this modifier, files ex- tracted from the archive will be stamped with the time of extraction.
P Use the full path name when matching names in the ar- chive.
This option will cause ar to match file names using a complete path name, which can be convenient when extracting a single file from an ar- chive created by another tool. Write an object-file index into the archive, or update an existing one, even if no other change is made to the archive. You may use this modifier flag either with any operation, or alone. Do not generate an archive symbol table. This can speed up building a large library in several steps.