UNIXUNIXInternetInternettelnetFTP

Internet InternetInternetDNSInternet

InternetInternet

Internet

DARPA70ARPANETTCP/IPARPANET1990ARPANET

InternetInternet

DNS[subdomain].[subdomain].[...].domain

InternetInternetcom edugov orgint milcn: ca : us:tw: hk: jp:fr: gb(uk): de:

InternetInternet edumis.tsinghua.edu.cn @ john@mail.tsinghua.edu.cn

InternetInternetInternet

IP32 166.111.4.11

InternetDNSDNSIPIP

InternetDNSnslookupnslookup: nslookup [-option] [host] [-Nameserver] option host :ip nameserver:

InternetDNS -hostexit IP

InternetInternet

InternetInternet

Internettelnet

Telnet telnet [hostname] [port] hostname: port:23telnet sun5000 telnet 166.111.7.250 telnet edumis.tsinghua.edu.cn 3000

telnet Trying.... // Connected to sun5000 Escape character is ^] login: passwd: sum5000 sum5000:unknow host

telnetTelnet Escape character is ^] telnet ^]telnet telnet> quittelnet

telnettelnet telnet> Print hekp information open connect to a site closeclose current connection quit exit telnettelnetman

FTP FTPFile Transfer Protocol

FTP ID: anonymousFTPFTPFTPman ftp

ftpftp [hostname] [port] ftp 166.111.7.250 ftp ftp.pku.edu.cn ftp ftp>

ftp> open ftp.pku.edu.cn ftp ftp> quit ftp> ? ftp> ? Command ftp> ? quit

ftp quit ftp (help) (help) command ! ftpshell Command shell

ftpFtp open [host] close user [name [passwd]]

ftp cd [directory] dir [directory] ls [directory] pwd lcd [directory] ! pwd

ftp put [[] ] mput [] mput *.txt mput test1.doc test2.doc test3.doc

ftp get [[]] mget [...] mget fi*

ftp ascii binary prompt yes/no: status

UNIXMAIL

SMTP POP

MAIL mail mail mailaddress mail qili@cic.tsinghua.edu.cn mail qili mail qili wuhp

MAIL mailmail & SHELLnumber #number q mail

MAIL d m r R u x mail

MAIL Subject: Cc: viCTRL-D . CTRL-C

MAIL mail~ ~q ~f ~r ~ Shell

ping: ping hosttalk: talk user@hostname mesg n write: write userfinger: finger user@hostname