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Rlogin is a UNIX service that s very similar to telnet. Using the rlogin command, you can log into a remote system just as you would using the telnet utility. Here is how you can use the rlogin command to remotely log into the server hp5: $ rlogin hp5
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You ll be prompted for a password after you issue the preceding command, and upon the validation of the password, you ll be logged into the remote server. To copy files from a server on the network, you don t necessarily have to log into 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 UNIX based command interface and a protocol that enables secure remote logins to a system. Net administrators use SSH widely to control web servers as well as other servers remotely. 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 and also encrypts the passwords. 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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Just as SSH is a secure alternative to traditional telnet, the scp service is a secure alternative to rcp, for transferring files between servers. The syntax for the scp command is similar to that of the rcp command: scp [-r] [[user@]host1:]file1 [...] [[user@]host2:]file2 The r option copies files recursively.
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Using FTP to Send and Receive Files
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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
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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.
UNIX System Performance Monitoring Tools
Several tools are available for monitoring the performance of the UNIX system. These tools check on the memory and disk utilization of the host system and let you know of any performance bottlenecks. In this section, you ll explore the main UNIX-based monitoring tools and see how these tools can help you monitor the performance of your system.
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