Copy files over network using compression

on the listening side: sudo nc -lp 2022 | sudo tar -xvf - and on the sending side: tar -cvzf - ./*| nc -w 3 name_of_listening_host 2022
This is useful for sending data between 2 computers that you have shell access to. Uses tar compression during transfer. Files are compressed & uncompressed automatically. Note the trailing dash on the listening side that makes netcat listen to stdin for data. on the listening side: sudo nc -lp 2022 | sudo tar -xvf - explanation: open netcat to -l listen on -p port 2022, take the data stream and pipe to tar -x extract, -v verbose, -f using file filename - means "stdin" on the sending side: tar -cvzf - ./*| nc -w 3 name_of_listening_host 2022 explanation: compress all files in current dir using tar -c create, -v verbose, -f using file, - filename - here means "stdout" because we're tar -c instead of tar -x, -w3 wait 3 seconds on stream termination and then end the connection to the listening host name_of_listening_host, on port 2022

2009-03-27 09:59:33

What Others Think

If you have scp on the client and the corresponding daemon on the server side, you can just use scp filename user@host:/target/directory
DNSpyder · 669 weeks and 5 days ago
Curious why a sudo is needed in "sudo nc -lp 2022" (port 2022 is not a privileged port)?
mpb · 669 weeks and 5 days ago
But where is the compression? You should pipe your data through bzip2, gzip whatever.
OJM · 669 weeks and 5 days ago
@OJM Good catch - I left out the "-z" option that filters the archive through gzip. Post modified. @mpb I should have pointed out that port 2022 is arbitrary and was open for me when I needed this command. It could be replaced with whatever works for you though. @DNSpyder scp works, but the combination of netcat & tar is faster even with compression turned on in scp (-C).
smcpherson · 669 weeks and 5 days ago
If you need encryption then use cryptcat:
OJM · 669 weeks and 5 days ago
asmoore82 · 669 weeks and 1 day ago
This works in reverse, too, i.e. the listening side can be the "sender": # on the listening/sending side tar -cvzf - ./* | nc -v -l 2022 # on the receiving side nc -v -w3 name_of_listening_host 2022 | tar -xvf - The listening netcat will wait for the incoming connection before it starts sending the input piped from tar.
jordan · 471 weeks and 5 days ago
seofox · 9 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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