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19.3 Services
19.3.1 /etc/services
The services available on your system through the network are described in the file /etc/services. This database matches services available with their port numbers and protocol, e.g. a few of the many network service entries are:
ftp 21/tcp # File Transfer Protocol
telnet 23/tcp # Telnet
smtp 25/tcp # Simple Mail Transfer Protocol
tftp 69/udp # Trivial File Transfer Protocol
www 80/tcp # World Wide Web
ntp 123/tcp # Network Time Protocol
ntp 123/udp # Network Time Protocol
Unix System Administration - 8 AUG 1996
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