Bash copy all files from remote directory
This article describes methods for copying files between different hosts on a network. It also explores the scp command and how to use it to copy files from a remote location.
scp command
Secure Copy Protocol (SCP) is a secure copy network protocol that facilitates smooth copying of files and folders between Unix-compatible operating systems.
scpThe cp command is a more secure variation of the cp command. It encrypts passwords and files during remote copying over a Secure Shell (SSH) connection, protecting communications from sniffing attacks.
For scpmore information, use the following command.
man scp
A man page (short for man pages) is a Unix utility that displays information about system calls, library calls, formal standards and conventions, and even abstract concepts. Since man pages are downloaded with the kernel, no internet connection is required.
Copying Files in Bash
There are multiple ways to copy files in Bash, cp, cat, vim (any text editor) and scp are just some of the many ways we can do so. The following code explores the ways to copy files in Bash.
- cp <source file>.txt <destination file>.txt
- cat 0<source_file.txt 1>destination_file.txt
- cat <source_file.txt >destination_file.txt
The first method copies the contents from the source file and then pastes them into the destination file. It is important to note that cp will paste the contents into the destination file even if it does not exist.
It does this because the kernel will automatically create the object file.
The second method uses concepts you learned in your operating systems course. Recall that ppfdt (process file descriptor table) file descriptor 0 refers to the keyboard (stdin), file descriptor 1 refers to the monitor (stdout), and file descriptor 2 refers to the monitor (stderror).
The second method overwrites descriptor 0 to point to the source file. It also overwrites standard output to point to the destination file.
Method three is similar to method two, except that in this method, descriptor 3 points to the source file and descriptor 4 points to the destination file.
In both methods 2 and 3, the source file is read and the destination file is written. Again, even if the destination file does not exist, the kernel will paste the contents into the destination file.
This is because the kernel automatically creates the object file.
Safely copy files across remote locations in Bash
The general syntax of the scp command is as follows.
scp [option] [user_name@source_host:path/to/source/file] [user_name@target_host:destination/path]
If we do not provide any username, then scp will use the current user as the default user. If you exclude the destination path, the scp command considers copying from the source to the current local path.
Likewise, omitting the source path will cause the scp command to use the current local path as the source for the copied files.
In this option, if you specify -r, it will recursively copy all the files and subdirectories. So if you want to copy files, don't specify any option. It will copy the files but will exclude the subdirectories.
The benefit of scp over other commands is that it is more secure when it comes to encrypting files.
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