[Linux Command Explanation Encyclopedia] 032. Introduce the rcp command in Linux: Simplify the file copy operation between hosts

rcp

Make file copy operations between two Linux hosts easier

Supplementary Note

rcpcommand to simplify file copy operations between two Linux hosts. With proper configuration, copying files between two Linux hosts without entering a password is as easy as local file copying.

grammar

rcp [选项] [参数]

options

• -p: Retain the attributes of the source file or directory, including owner, group, permission and time;
• -r: Recursive processing, processing the files and subdirectories under the specified directory together;
• -x: Encrypt all information transmitted between two Linux hosts.
• -D: Specify the port number of the remote server.

The home directory of the user with the same name . If no remote username is given, the current username is used. If the path on the remote machine contains special shell characters, it needs to be enclosed in backslashes \\, double quotes ""or single quotes , so that all shell metacharacters can be interpreted remotely. ''It should be noted that, rcpwithout prompting for a password, it rshexecutes the copy through commands.

Each file or directory parameter of directory can be either a remote file name or a local file name. The remote file name has the following form rname@rhost:path, where rnameis the remote user name, rhostis the remote computer name, and pathis the path to this file.

parameter

• 源文件: Specifies the source file to copy. There can be multiple source files.

example

Conditions for using the rcp command

If there is a file on the system /etc/hosts, the system administrator should ensure that the file contains entries for the remote hosts with which to communicate. Configuration process:

Only valid for root users

1. Create a file under the root directory of both root users rhostsand hostnameadd the files of both parties. Before that, the other party /etc/hosts's ip andhostname
2. Start rshthe service, redhat does not start by default.
   Method: Execute ntsysvthe command, rshselect it with the space bar before the option, and confirm to exit. Then execute service xinetd restartit.
3. Go to /etc/pam.d/the directory and comment out a line rshin the file auth required /lib/security/pam_securetty.sowith "#". (Only by commenting out this line, you can log in with root user)

Copy from the current directory test1to webserver1a remote system named :

rcp test1 webserver1:/home/root/test3

In this case, test1it is copied to the remote subdirectory test3with the same name as test1. If only the remote hostname is provided, rcpwill be test1copied to the remote home directory, still named test1.

You can also include the filename in the destination directory. For example, to copy a file to webserver1a system called :

rcp test1 webserver1:/home/root/test3

In this case, test1copy to the remote directory rootand name it test3.

Copying files from a remote system: To copy files from a remote system to a local directory:

rcp remote_hostname:remote_file local_file

webserver1Copy from the remote system test2to the current directory:

rcp webserver1:/home/root/test2 .

.is shorthand for "current directory". In this case, the in the remote directory test2is copied to the current directory, the name is still test2.

Provide a destination filename if you wish to copy the file with a new name. If you wish to test2copy to a different directory on your local system, use the following absolute or relative pathnames:

rcp webserver1:/home/root/test2 otherdir/

Or, if you wish to copy the file to a different directory with a different filename:

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

Copy the directory to the remote system:

To copy a local directory and its files and subdirectories to a remote system, use rcpthe and -r(recursive) options together.

rcp -r local_dir remote_hostname:remote_dir

If not in the current directory , in addition to the local directory name, a relative pathname (starting from the current directory) or an absolute pathname ( starting local_dirfrom the top-level directory) is also required . /Also, if there is no under the home directory remote_dir, then a relative path (starting from the home directory) or absolute path ( starting from the ) remote_dirwill be required ./

To workcopy the entire subdirectory named to a directory webserver1named under the home directory on the remote computer products, type:

rcp -r work webserver1:/home/root/products

This command creates a directory named webserver1:/home/root/productsunder workand its entire contents (assumed /home/root/productsto already exist webserver1in ).

This example assumes the user is in workthe local directory containing . Otherwise, a relative or absolute path to the directory must be provided, eg /home/root/work.

Copy a directory from a remote system:

rcpTo copy a remote directory and all its files and subdirectories to a local directory, use the and -r(recursive) options in the following syntax .

rcp -r remote_hostname:remote_dir local_dir

To workcopy a remote directory named to the current directory, type:

rcp -r webserver1:/home/root/work .

.Indicates the current directory. The directory will be created under this directory work.

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