Difference between revisions of "Remote File Copy from the Linux Command Prompt"

Latest revision as of 16:06, 24 July 2020

SCP - Secure Copy Protocol

This utility is handy for transferring files from one Linux system directly to another using ssh security with authentication. Unline rcp, scp will ask for passwords or passphrases if they are needed for authentication.

Upload/PUSH (syntax):

 scp </local/file(s)/to/transfer> <login-name>@<hostname>:</remote/dir/to/transfer/to>

Upload/PUSH (example):

 scp index.html username@www.companyname.com:/usr/httpd/virtual/www.companyname.com/html

Download/PULL (syntax):

 scp <your-login>@<hostname>:</path/to/remote/file> </local/directory>

Download/PULL (example):

 scp -r username@www.companyname.com:/usr/httpd/virtual/www.companyname.com/html  /mylocalpc/mywebsitedirectory

Useful options:

 -p preserve timestamp and info       -B batch mode
 -r recursive copy                    -C compression
 -v verbose mode                      -P port

Useful example: If you are using a remote server that you need to push files and directories to, and the remote server utilizes a nonstandard port, it might look like this (example):

scp -P 2800 -r ./* nicolep@customerwebhosting.robotz.com:/home/nicolep/awesomesite.com

THE TROUBLE WITH SPACES

• scp: ambiguous target - error which often indicates white space has disrupted scp understanding the path. If you have character 32 in a path, you have to escape the characters by using double backslashes \\ and enclosing the entire path in quotes:

scp myfile.txt nicolep@192.168.1.1:"/file\\ path\\ with\\ spaces/secrets.txt"

When uploading, the local source path does not require double quotes and double backslashes. The local path will follow the same rules a bash shell path follows.

scp ~/.local/share/Metagaming\ B.V./Angeldust/player_name* nicolep@192.168.0.3:"/home/nicolep/.local/share/Metagaming\\ B.V./Angeldust/"

Why scp works this way is beyond me, I just hope the devs have a good reason for it.

SCP For Macintosh OSX:

Need to transfer files between linux and Mac OSX?

• see: Secure Shell - Secure Copy Available on OSX

Insecure File Copy

ie: Netcat File Copy. It's not really called Insecure File Copy, but to make a point, only use this method on your private LAN for files where security does not matter. This is the quick and dirty way to move a file even if ssh is not installed. Although netcat has many functions, you can copy a file from one machine to another using Netcat.

You basically issue the netcat command on the receive computer assigning a port with a redirect to file output. It will sit and listen for a connection then terminate when complete. Type this on the receive computer:

 nc -l 2222 > myfile.pdf

Then on the source machine which is at IP address 192.168.50.1 in our example where the file exists you type the following:

 nc 192.168.50.1 2222 < myfile.pdf

You don't have to use port 2222, and you call the file whatever you want as long as the extensions are the same, and so on.

For multiple files you can use tar to put them all in a tarball then expand on the destination

tar zc *.* | nc -l 2222

nc 192.168.50.1 2222 | tar zx

Remember that netcat simply reads data from stdin.

RZSZ - XMODEM, YMODEM, ZMODEM file transfer

This utility is handy for transferring files from a Microsoft Windows system to or from a Linux system over tcp/ip. It is also useful to transfer files to or from Linux systems using a serial cable and minicom. The RZSZ package includes (sx, sb, sz, rx, rb, rz) commands.

Upload (syntax):

Upload (example):

Download (syntax):

Download (example):

ZSSH - File transfer using Secure Shell and RZSZ

zssh (Zmodem SSH) is a program for interactively transferring files to and from a remote machine while using ssh. It is intended to be a convenient alternative to scp, allowing the transfer of files without having to open another session and re-authenticate. zssh is an interactive wrapper for ssh used to switch the ssh connection between the remote shell and file transfers. Files are transferred through zmodem protocol, using the rz and sz commands.

Upload (syntax):

Upload (example):

Download (syntax):

Download (example):

RCP - remote file copy

This utility is handy for transferring files from one Linux system directly to another using remote shell. It does not prompt for passwords, and it performs remote execution through rsh requiring the same authentication.

Upload (syntax):

Upload (example):

Download (syntax):

Download (example):