- ext
- clib
- socket.pl
- uid.pl -- User and group management on Unix systems
- unix.pl -- Unix specific operations
- syslog.pl -- Unix syslog interface
- filesex.pl
- uri.pl -- Process URIs
- process.pl -- Create processes and redirect I/O
- time.pl -- Time and alarm library
- sha.pl -- SHA secure hashes
- crypt.pl
- memfile.pl
- uuid.pl -- Universally Unique Identifier (UUID) Library
- hash_stream.pl -- Maintain a hash on a stream
- md5.pl -- MD5 hashes
- streampool.pl -- Input multiplexing
- udp_broadcast.pl -- A UDP broadcast proxy
- prolog_stream.pl -- A stream with Prolog callbacks
- cgi.pl -- Read CGI parameters
- rlimit.pl
- clib
- initgroups(+User, +Group) is det
- Initialise the group access list of the calling process to the registered groups for User and the group Group. This predicate is only available if the underlying OS provides it.