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Telnet is an Internet protocol for accessing remote computers from your PC or from another UNIX server or workstation. Your machine simply needs to be connected to the target machine through a network, and you must have a valid user account on the computer you are connecting to. To use telnet on your PC, for example, go to the DOS prompt and type telnet. At the telnet prompt, type in either the UNIX server s IP address or its symbolic name, and your PC will connect to the server. Unless you are doing a lot of file editing, telnet is usually all you need to connect and work with a UNIX server, in the absence of a terminal emulator. The following example session shows a connection being made to and disconnection from a server named hp50. Of course, what you can do on the server will depend on the privileges you have on that machine. $ telnet hp5 Trying... Connected to hp5.netbsa.org. Escape character is '^]'. Local flow control on Telnet TERMINAL-SPEED option ON login: oracle Password: Last successful login for oracle: Tue Nov CST6CDT 2002 on tty
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CHAPTER 3 ESSENTIAL UNIX (AND LINUX) FOR THE ORACLE DBA
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Last unsuccessful login for oracle: Thu Oct 24 09:31:17 CST6CDT 2002 on tty Please wait...checking for disk quotas ... You have mail. TERM = (dtterm) oracle@hp5[/u01/app/oracle] $ Once you log in, you can do everything you are able to do when you log directly into the server without using telnet. You log out from your telnet session in the following way: $ exit logout Connection closed by foreign host. $
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Rlogin is a UNIX service that s very similar to telnet. Using the rlogin command, you can log in to a remote system just as you would using the telnet utility. Here is how you can use the rlogin command to remotely log in to the server hp5: $ rlogin hp5 You ll be prompted for a password after you issue the preceding command, and upon the validation of the password, you ll be logged in to the remote server. To copy files from a server on the network, you don t necessarily have to log in to that machine or even use the FTP service. You can simply use the rcp command to copy the files. For example, to copy a file named /etc/oratab from the server hp5 to your client machine (or to a different server), you would use the rcp command as follows: $ rcp hp5:/etc/oratab/ .
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The dot in the command indicates that the copy should be placed in your current location. To copy a file called test.txt from your current server to the /tmp directory of the server hp5, you would use the rcp command as follows: $ rcp /test/txt hp5:/tmp
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The secure shell, SSH, is a protocol like Telnet that enables remote logins to a system. The big difference between the ssh command (which uses the SSH protocol) and rlogin is that SSH is a secure way to communicate with remote servers SSH uses encrypted communications to connect two untrusted hosts over an insecure network. The plan is for ssh to eventually replace rlogin as a way to connect to remote servers. Here s an example of using the ssh command to connect to the hp5 server: $ ssh prod5 Password: Last successful login for oracle: Thu Apr Last unsuccessful login for oracle: Fri Apr oracle@prod5 [/u01/app/oracle] $
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7 09:46:52 CST6CDT 2005 on tty 1 09:02:00 CST6CDT 2005
CHAPTER 3 ESSENTIAL UNIX (AND LINUX) FOR THE ORACLE DBA
Using FTP to Send and Receive Files
FTP the File Transfer Protocol, is a popular way to transmit files between UNIX servers or between a , UNIX server and a PC. It s a simple and fast way to send files back and forth. The following is a sample FTP session between my PC and a UNIX server on my network. I am getting a file from the UNIX server called prod5 using the ftp get command. $ ftp prod5 connected to prod5 ready. User (prod5:-(none)): oracle 331 Password required for oracle. Password: User oracle logged in. ftp> pwd '/u01/app/oracle" is the current directory. ftp> cd admin/dba/test CWD command successful. ftp> get analyze.ksh 200 PORT command successful. 150 Opening ASCII mode data connection for analyze.ksh (3299 bytes). 226 Transfer complete. ftp: 3440 bytes received in 0.00Seconds 3440000.00Lbytes/sec. ftp> bye 221 Goodbye. $ If, instead of getting a file, I wanted to place a file from my PC onto the UNIX server I connected to, I would use the put command, as in put analyze.ksh. The default mode of data transmission is the ASCII character text mode; if you want binary data transmission, just type in the word binary before you use the get or put command. Of course, GUI-based FTP clients are an increasingly popular choice. If you have access to one of those, transferring files is usually simply a matter of dragging and dropping files from the server to the client, much like moving files in Windows Explorer.
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