One Linux command per day (--RCP) command

RCP stands for "Remote file copy". This command is used to copy files between computers. The RCP command has two forms. The first format is used for file-to-file copies, and the second format is used for copying files or directories to another directory.

1. Command format:

rcp [parameters] [source file] [target file]

2. Command function:

The RCP command copies files or directories at the remote end, such as specifying more than two files or directories at the same time, and the final destination is a directory that already exists, it will copy all previously specified files or directories to that directory.

3. Command parameters:

-R recursively copies all the contents of the source directory to the destination directory. To use this option, the destination must be a directory.

The-P view retains the modified time and mode of the source file, ignoring umask.

-K requests that RCP obtain a Kerberos license for the remote host within the specified zone, rather than obtaining a Kerberos license for the remote host in the remote host zone determined by Krb_relmofhost.

-X turns on DES encryption for all transmitted data. This affects response time and CPU utilization, but can be too high-security, if the path specified in the file name is not the full pathname, then this path is interpreted to be relative to the home directory of the user with the same name on the remote machine. If the remote user name is not given, the current user name is used. If the path on the remote machine contains special shell characters, it needs to be surrounded by backslashes (\ \), double quotes, or single quotes so that all shell metacharacters can be interpreted remotely. It is important to note that RCP does not prompt for a password, which executes the copy through the RSH command.

Directory each file or directory parameter can be either a remote file name or a local file name. The remote file name has the following form: [email protected]:p ath, where rname is the remote user name, Rhost is the remote computer name, and path is the pathname of this file.

4. Usage examples:

To use RCP, the following conditions are required:

If the system has a/etc/hosts file, the system administrator should ensure that the file contains the entries for the remote host with which to communicate.

There is a line of text in the/etc/hosts file that contains the following information for each remote system

Internet_address Official_name Alias

For example:

9.178.12.** Webserver1.com.51.webserver

. rhosts file

The. rhosts file is located in the home directory of the remote system, which contains the local system name and the local login name.

For example, an entry in a. rhosts file for a remote system might be:

WebServer1 Root

Where WebServer1 is the name of the local system and root is the local login name. In this way, root on the webserver1 can copy files back and forth in the remote system that contains the. rhosts file.

Configuration process:

Valid only for the root user

1. Create the. rhosts file in the root directory of both parties and add the hostname of both parties, before adding each other's IP and hostname in the/etc/hosts file of both parties.

2. Starting the Rsh service, Redhat is not started by default.

Method: Use the Execute NETSYSV command, with the SPACEBAR selected before the RSH option, to determine exit. Then execute:

Service xinetd Restart can

3. To the/etc/pam.d/directory, put the auth in the rsh file required/lib/security/pam_securetty.so

A line is commented out with "#". (only comment out this line in order to log in with the root user)

command to use:

Copying files to a remote system

To copy files from the local system to the remote system, use the following command:

Rcplocal_fileremore_hostname:remote_fileenter

Note that if there is no local_file in the current directory, you will need to provide a relative path (starting from the current directory) or an absolute pathname (from/To), in addition to the local file name.

You need to make a complete (absolute) path only if you want to place the Remote_file on Remote_hostname in a different directory (except for the Remote home directory).

Use instance 1: Copy the test1 under the current directory to a remote system named WebServer1

Command:

rcp test1 webserver1:/home/root/test3

Description

In this case, Test1 is copied to the remote subdirectory test3, and the name is still test1. If only the remote host name is provided, RCP will copy the test1 to the remote home directory, and the name will still be test1.

You can also include the file name in the destination directory. For example, copy the file to a system named Webserver 1.

rcp test1 webserver1:/home/root/test3

In this case, copy the test1 to the remote directory root and command it to TEST3

Use instance 2: Copy files from a remote system: to copy files from a remote system to a local directory

Command:

rcp remote_hostname:remote_file local_fileenter

Use instance 3: Copy the test2 from the remote system WebServer1 to the current directory:

Command:

rcp webserver1:/home/root/test2. Enter

Description

The dot (.) is a shorthand for the current directory. In this case, the test2 in the remote directory is copied to the current directory, and the name is still test2

If you want to copy the file with a new name, provide the destination file name.

If you want to copy Test2 to a different directory on your local system, use the following absolute or relative path names:

rcp webserver1:/home/root/test2 otherdir/enter

Or, if you want to copy the file to a different directory with another file name:

rcp webserver1:/home/root/test2 otherdir/otherfile Enter

Use instance 4: Copy the directory to the remote system: to copy the local directory and its files and subdirectories to the remote system, use both the RCP and-R (recursive) options.

Command:

Rcp-r Local_dir Remote_hostname:remote_dir Enter

Description

If there is no local_dir in the current directory, you will need to provide a relative pathname (starting from the current directory) or an absolute pathname (beginning with the/top-level directory) In addition to the local directory name. Also, if there is no remote_dir in the home directory, then Remote_dir will need a relative path (self-service directory start) or an absolute path (from/to start).

Use Example 5:

To completely copy a subdirectory named work to a directory named products in the home directory on the Webserver remote computer, type the following:

Rcp-r work Webserver1:/home/root/products Enter

This command creates a directory named work under Webserver1:/home/root/products and all its contents (assuming that/home/root/products already exists in WebServer1)

This example assumes that the user is in a local directory that contains work. Otherwise, you must provide a relative or absolute path to the directory, such as/home/root/work.

Example 6: Replicating a directory from a remote system

To copy the remote directory and all of its files and subdirectories to a local directory, use the RCP and-R (Recursive) options in the following syntax.

Command:

Rcp-r Remote_hostname:remote_dir Local_dir Enter

To copy the remote directory named work to the current directory, type the following:

Rcp-r Webserver1:/home/root/work. Enter

The point (.) indicates the current directory. The work directory will be created under this directory.

My pro test: Connection refused. The real egg hurts.

One Linux command per day (--RCP) command