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$ rcp remote-system-name:source-file copy-file
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In the next example, the user copies the file wednesday from the remote system violet to her own system and renames the file today:
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$ rcp violet:wednesday today
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You can also use scp or rcp to copy whole directories to or from a remote system The scp command with the -r option copies a directory and all its subdirectories from one system to another Like the cp command, these commands require source and destination directories The directory on the remote system requires that the system name and colon be placed before the directory name When you copy a directory from your own system to a remote system, the copy directory is on the remote system and requires the remote system s name In the next example, the user uses the scp command to copy the directory letters to the directory oldnotes on the remote system violet:
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$ scp -r letters violet:oldnotes
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PART IV
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NOTE For backups or copying a large number of files, use rsync
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At times, you may need to execute a single command on a remote system The rsh command executes a Linux command on another system and displays the results on your own Your system name and login name must, of course, be in the remote system s k5login file For SSH-enabled network connections, you can use ssh instead of rsh The ssh and rsh commands take two general arguments: a system name and a Linux command The syntax is as follows:
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$ rsh remote-system-name Linux-command
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Part IV:
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In the next example, the rsh command executes an ls command on the remote system violet to list the files in the /home/robert directory on violet:
$ rsh violet ls /home/robert
Special characters are evaluated by the local system unless quoted If you quote a special character, it becomes part of the Linux command evaluated on the remote system Quoting redirection operators enables you to perform redirection operations on the remote system In the next example, the redirection operator is quoted It becomes part of the Linux command, including its argument, the filename myfiles The ls command then generates a list of filenames that is redirected on the remote system to a file called myfiles, also located on the remote system
$ ssh violet ls /home/robert '>' myfiles
The same is true for pipes The first command (shown next) prints the list of files on the local system s printer The standard output is piped to your own line printer In the second command, the list of files is printed on the remote system s printer The pipe is quoted and evaluated by the remote system, piping the standard output to the printer on the remote system
$ ssh violet ls /home/robert | lpr $ ssh violet ls /home/robert '|' lpr
NOTE The Kerberos versions of the remote commands also let you specify Kerberos realms and
credentials
PART
Security
CHAPTER 16 Encryption, Integrity Checks, and Signatures CHAPTER 17 Security-Enhanced Linux CHAPTER 18 IPsec and Virtual Private Networks CHAPTER 19 Secure Shell and Kerberos CHAPTER 20 Firewalls
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CHAPTER
Encryption, Integrity Checks, and Signatures
ou can use encryption, integrity checks, and digital signatures to protect data transmitted over a network For example, the GNU Privacy Guard encryption package lets you encrypt your email messages or files you want to send, as well as letting you sign them with an encrypted digital signature authenticating that the message was sent by you The digital signature also includes encrypted modification digest information that provides an integrity check, allowing the recipient to verify that the message received is the original and not one that has been changed or substituted This type of encryption was originally implemented with Pretty Good Privacy (PGP) Originally a privately controlled methodology, it was handed over to the Internet Engineering Task Force (IETF) to support an open standard for PGP called OpenPGP (see Table 16-1) Any project can use OpenPGP to create encryption applications, such as GnuPGP Commercial products for PGP are still developed by the PGP Corporation, which also uses the OpenPGP standard
Public Key Encryption, Integrity Checks, and Digital Signatures
Encrypting data is the only sure way to secure data transmitted over a network Encrypt data with a key, and the receiver or receivers can later decrypt it To fully protect data transmitted over a network, you should not only encrypt it, but also check that it has not been modified, as well as confirm that it was actually created by the claimed author An encrypted message could still be intercepted and modified and then reencrypted Integrity checks such as modification digests make sure that the data was not altered Though encryption and integrity checks protect the data, they do not authenticate it You also need to know that the person who claimed to send a message actually is the one who sent it, rather than an imposter To authenticate a message, the author can sign it using a digital signature This signature can also be encrypted, allowing the receiver to validate it Digital signatures ensure that the message you receive is authentic
Part V:
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