# [ADDR:]service_name must be in /etc/services, or port number # socket_type stream/dgram/raw/rdm/seqpacket # protocol tcp/udp # wait/nowait[.max] wait is usually for udp, nowait for tcp # max: max copies to run # user[.group] or user[:group] user and group to run under # binary program to run # arg0 arg1 arg2... arguments, INCLUDING program name (arg0) # serv socket pro w/nw user binary args # IPv6 555 dgram udp6 wait root echo echo Hello IPv6 udp world # ...with ADDR prefix: ::1:444 stream tcp6 nowait root echo echo Hello IPv6 localhost # Rarely seen case: tcp *wait* service telnet stream tcp wait root telnetd telnetd -w10