services(5) File Formats Manual services(5) services - services -- ASCII, , . ( ) . C getservent(3), getservbyname(3), getservbyport(3), setservent(3) endservent(3) . IANA (Internet Assigned Numbers Authority), TCP- UDP- . , , TCP. 1024 ( <<>> ) ( bind(2), tcp(7) udp(7)). , , , , , , , <<>> - . , IANA, . services , . inetd.conf(5) . , inetd(8), inetd.conf(5). , (NNTP) (SMTP) . services _PATH_SERVICES . /etc/services. : - / [ ...] : - , . . -. ( ), . , . protocols(5). , tcp udp. , . , . . (#) . . , ( ). , . , a-z, 0-9 (-) . ( getservent(3), getservbyname(3) getservbyport(3). , ). , Yellow Pages/NIS BIND/Hesiod. services: netstat 15/tcp qotd 17/tcp quote msp 18/tcp # message send protocol msp 18/udp # message send protocol chargen 19/tcp ttytst source chargen 19/udp ttytst source ftp 21/tcp # 22 - unassigned telnet 23/tcp /etc/services _PATH_SERVICES . listen(2), endservent(3), getservbyname(3), getservbyport(3), getservent(3), setservent(3), inetd.conf(5), protocols(5), inetd(8) RFC , RFC 1700, (.. STD0002). Alexander Golubev , Azamat Hackimov , Hotellook, Nikita , Spiros Georgaras , Vladislav , Yuri Kozlov ; GNU 3 , . . , , . Linux man-pages 6.06 31 2023 . services(5)