Transfer files


(user@src)_$: scp <file> <user>@<IP dst>:<directory dst>


(user@dst)_$: nc -l 8888 > file.bak
(user@src)_$:  nc <IP dst> 8888 < file

You can also use cat but it will be probably slower:

(user@dst)_$: nc -l 8888 > file.bak
(user@src)_$:  cat file | nc <IP dst> 8888

You can use pv to display a progress bar:

(user@src)_$: apt-get install pv
(user@dst)_$: nc -l 8888 > file.bak
(user@src)_$:  pv file | nc 8888
3.72GB 0:00:56 [62.7MB/s] [=============================>               ] 49% ETA 0:00:57

Python 2:

(user@src)_$: python  -m SimpleHTTPServer 8080
(user@dst)_$: wget http://src:8080/file

Python 3:

(user@src)_$: python3 -m http.server 8080
(user@dst)_$: wget http://src:8080/file

Get maximum transfer speed

(user@dst)_$: nc -l 8888 > /dev/null
(user@src)_$: pv /dev/zero | nc <IP dst> 8888

Limit maximum transfer speed

To 200 Kbit/s:

(user@src)_$: scp <file> <user>@<IP dst>:<directory dst> -l 200

To 50KB/s: (50KB/s == 400Kbit/s)

(user@src)_$: scp <file> <user>@<IP dst>:<directory dst> -l 400

Change the transfer process’ priority

A process has a higher priority when you lower its niceness (NI) value which ranges from -20 to 19. Thus a process with niceness -20 has the highest priority. The niceness must not be confused with the kernel priority (PR) which can not be manually modified.

If the transfer is not going fast enough, we can increase the priority of the transfer process.

Get process PID:

_$: ps aux | grep nc

Check priority (PR) and niceness (NI):

_$: top -p <PID>

Change niceness:

_$: renice -10 <PID>